Practice Test


Q1) Each of the following is true for white and red phosphorus except that they Show Answer


Q2) Which of the following oxides will be least acidic? Show Answer


Q3) Which of the following contains a coordinate bond ? Show Answer


Q4) Which of the following P is thermodynamical most stable ? Show Answer


Q5) Which of the following goes under sublimation? Show Answer


Q6) The structure of white phosphorus is Show Answer


Q7) The most acidic of the following compound is Show Answer


Q8) Which of the following molecule is linear ? Show Answer


Q9) Which one of the following oxides of nitrogen is blue solid ? Show Answer


Q10) What causes nitrogen to be chemically inert ? Show Answer


Q11) In which of the following the bond angle is maximum ? Show Answer


Q12) Which one of the following arrangement of molecules is correct on the basis of their dipole moments ? Show Answer


Q13) Which of the following is an oxyacid? Show Answer


Q14) Which one of the following elements is most metallic ? Show Answer


Q15) The substance used in smoke is Show Answer


Q16) The number pf P - O - P bridges in the structure of phosphorus pentoxide and phosphorus trioxide are respectively Show Answer


Q17) An example of neutral oxide is Show Answer


Q18) Phosphide ion has the electronic structure similar to that of Show Answer


Q19) Phosphine is not obtained by the reaction when Show Answer


Q20) With respect to protonic acids, which of the following statement is correct ? Show Answer


Q21) White phosphorus when boiled with strong solution of caustic soda produce Show Answer


Q22) Phosphorus pentoxide finds use as Show Answer


Q23) Which one of the following pentafluorides cannot be formed ? Show Answer


Q24) Which element from group 15 gives most basic compound with hydrogen ? Show Answer


Q25) Which of the following has least covalent P - H bond? Show Answer


Q26) The oxyacid of phosphorus in which phosphorus has the lowest oxidation state is Show Answer


Q27) The oxidation state of nitrogen is highest in Show Answer


Q28) When ammonia is heated with cupric oxide, a molecule of ammonia will Show Answer


Q29) The three important oxidation states of phosphorus are Show Answer


Q30) Nitrogen shows different oxidation states in the range. Show Answer


Q31) Which of the following is arranged in the increasing order of enthalpy of vaporization ? Show Answer


Q32) Which of the following is not correct ? Show Answer


Q33) Phosphine is prepared by the action of Show Answer


Q34) Which of the following substance is used as fertilizer ? Show Answer


Q35) The chemical formula for tartar emetic is Show Answer


Q36) Which of the following phosphorus is most reactive ? Show Answer


Q37) Which of the following species is isoelectronic with CO? Show Answer


Q38) Which one of the following molecules will have unequal bond length ? Show Answer


Q39) Which one has the lowest boiling point? Show Answer


Q40) Sodium hexametaphosphate is known as Show Answer


Q41) The reduction of calcined phosphate rock with coke and sand in an electric arc furnace at 1773 K gives a number of products including Show Answer


Q42) What are the product obtained when ammonia reacted with excess chlorine? Show Answer


Q43) The most stable hydride is Show Answer


Q44) Which of the following is a tetrabasic acid ? Show Answer


Q45) Metaphosphoric acid has the formula ? Show Answer


Q46) Basicity of orthophosphoric acid is Show Answer


Q47) The oxide which is the anhydride of orthophosphoric acid is Show Answer


Q48) At. No. of N is 7, the at. no. of the third member of nitrogen family will be Show Answer


Q49) The structural formula of hypophosphorous acid is Show Answer


Q50) Which of the following is an ionic compound ? Show Answer


Q51) The NO molecule Show Answer


Q52) Which among the following is a deliquescent ionic solid ? Show Answer


Q53) Which of the following catalysts is commonly employed in the manufacture of ammonia by the Haber's process ? Show Answer


Q54) A solution of sodium in liquid ammonia is blue due to the presence of Show Answer


Q55) Which of the following molecule is stable, not hydrolysed by water, and has little tendency to act as a donor ? Show Answer


Q56) By reacting with which of the following reagents does ammonia produce a brown precipitate ? Show Answer


Q57) Which of the following allotropic forms of phosphorus is the most stable, least reactive has a graphite-like structure, and is good conductor of electricity ? Show Answer


Q58) Among the following molecule, which contain the maximum number of P - H bonds ? Show Answer


Q59) Which of the following oxides of nitrogen is a mixed anhydride of two acids ? Show Answer


Q60) Which of the following statement is incorrect for nitric oxide ? Show Answer


Q61) Which among the following is the least basic ? Show Answer


Q62) Which of the following compound does not produce ammonia on heating ? Show Answer


Q63) Ammonia gas is dried over Show Answer


Q64) The number of P-O-P bonds in cyclic metaphosphoric acid is Show Answer


Q65) Laughing gas is Show Answer


Q66) The chemical used for cooling in refrigeration is Show Answer


Q67) Nitrogen is essential constituent of all Show Answer


Q68) Which of the following statement is not correct for nitrogen ? Show Answer


Q69) Which acts both as an oxidizing as well as reducing agent ? Show Answer


Q70) Which of the following can be used as an anaesthetic ? Show Answer


Q71) The shape of ammonia molecule is Show Answer


Q72) The aqueous solution/liquid that absorbs nitric oxide to a considerable extent is Show Answer


Q73) When ammonia nitrate is gently heated , an oxide of nitrogen is formed. What is the oxidation state of nitrogen in this oxide ? Show Answer


Q74) Which of the following not correct ? Show Answer


Q75) Which one of the following nitrogen oxides is the anhydride of nitrous acid ? Show Answer


Q76) Of the following which is paramagnetic and has three electron bond in its structure ? Show Answer


Q77) Nitrous oxide is Show Answer


Q78) One of the oxidants used with liquid propellants is Show Answer


Q79) Which one of the following is used in the industrial preparation of nitric acid by Ostwald's process ? Show Answer


Q80) Concentrated nitric acid oxidized phosphorus to Show Answer


Q81) Nitrogen dioxide Show Answer


Q82) Red P can be obtained from white P by Show Answer


Q83) Phosphine is produced by adding water to Show Answer


Q84) The number of hydroxyl groups in pyrophosphoric acid is Show Answer


Q85) Which oxide does not act as a reducing agent ? Show Answer


Q86) Which of the following is paramagnetic ? Show Answer


Q87) The P-P-P bond angle in white phosphorus is Show Answer


Q88) Which of the following fluorides does not exist ? Show Answer


Q89) When ammonia is passed over heated copper oxide , the metallic copper is obtained. The reaction show that ammonia is Show Answer


Q90) The correct sequence of decrease in the bond angle of the following hydrides is Show Answer


Q91) Which is most explosive ? Show Answer


Q92) The stability of the hydrides follows the order Show Answer


Q93) Among the trihalides of nitrogen which one is most basic ? Show Answer


Q94) Which of the following is a cyclic phosphate ? Show Answer


Q95) The acid which forms two series of salts is Show Answer


Q96) Which of the following has highest dipole moment ? Show Answer


Q97) Which of the following is metaphosphoric acid ? Show Answer


Q98) Which of the following non-metal possesses the atomicity half that of sulphur ? Show Answer


Q99) P-O-P bond is present in Show Answer


Q100) Which one of the following substance has the highest proton affinity ? Show Answer


Q101) What may be expected to happen when phosphine gas is mixed with chlorine gas ? Show Answer


Q102) Which of the following oxide of nitrogen is coloured gas ? Show Answer


Q103) The lighting in the atmosphere causes the formation of Show Answer


Q104) Nitrogen is liberated by the thermal decomposition of only Show Answer


Q105) On heating ammonium dichromate, the gas evolved is Show Answer


Q106) One mole of calcium phosphide on reaction with excess of water gives Show Answer


Q107) Nitrates of all metals are Show Answer


Q108) Oxidation state of phosphorus varies from Show Answer


Q109) The largest bond angle is in Show Answer


Q110) Slow acting nitrogenous fertilizer among the following is Show Answer


Q111) Liquid ammonia is used in refrigeration because of its Show Answer


Q112) Bone black is a polymorphic form of Show Answer


Q113) Which of the following oxy acids of phosphorus is a reducing agent and monobasic ? Show Answer


Q114) When tin is treated with concentrated nitric acid Show Answer


Q115) The number of hydrogen atom(s) attached to phosphorus atom in hypophosporus acid is Show Answer


Q116) Regular use of the following fertilizers increase the acidity of the soil ? Show Answer


Q117) The nitrogen oxide(s) that contains N - N bond(s) is(are) Show Answer


Q118) Ozone is not Show Answer


Q119) Which of the following oxides is a peroxide ? Show Answer


Q120) Polyanion formation is maximum in Show Answer


Q121) Acidified solution of sodium thisulphate are unstable because in thiosulphate Show Answer


Q122) Which is an oxidizing agent amongst the following Show Answer


Q123) Which of the following bonds has highest energy ?
Show Answer


Q124) Which is most acidic in nature ? Show Answer


Q125) All the element of oxygen family are Show Answer


Q126) Which of the following hydrides is most acidic ? Show Answer


Q127) Which is the best oxidizing agent among the following ? Show Answer


Q128) A group 16 element exists in monoatomic state in the metallic lattice. It also exists in two crystalline forms. The metal is Show Answer


Q129) Oxygen molecule is Show Answer


Q130) Which of the following causes damage to the building containing calcium and responsible for cough and choking in human? Show Answer


Q131) Which of the following is an oxoacid ? Show Answer


Q132) Which of the following is incorrect? Show Answer


Q133) Photoconductors of xerox machine uses Show Answer


Q134) Bond angle is minimum for Show Answer


Q135) Sulphur molecule is Show Answer


Q136) Ozone belong to which group of the periodic table ? Show Answer


Q137) Identify the incorrect statement with respect to ozone. Show Answer


Q138) Electron affinity of sulphur is Show Answer


Q139) The number of electron that are paired in oxygen molecule are Show Answer


Q140) Oxidation state of oxygen is zero in Show Answer


Q141) There is S-S bond in Show Answer


Q142) Iron sulphide is heated in air to form A , an oxide of sulphur. A is dissolved in water to give an acid. The basicity of this acid is ......... Show Answer


Q143) The manufacturing of sulphuric acid by the contact process involves the catalyst Show Answer


Q144) Which of the following is acidic ? Show Answer


Q145) Which of the following formula represent the fuming sulphuric acid (oleum) ? Show Answer


Q146) Which of the following properties is not correct for ozone ? Show Answer


Q147) Crystalline form of sulphur stable at room temperature is Show Answer


Q148) The element which has a simple cubic lattice in solid state is Show Answer


Q149) Which shows maximum catenation property ? Show Answer


Q150) Which of the following oxides reacts with HCl and NaOH ? Show Answer


Q151) Permonosulphuric acid is known as Show Answer


Q152) The metal with highest electrical resistance at room temperature is Show Answer


Q153) The compound containing coordinate bond is Show Answer


Q154) The compound of sulphur that can be used as refrigerant is Show Answer


Q155) Which would quickly absorb oxygen ? Show Answer


Q156) Which of the following behaves as both oxidising and reducing agent ? Show Answer


Q157) Which of the following is formed by the action of water on sodium peroxide ? Show Answer


Q158) Which of the following is not tetrahedral ? Show Answer


Q159) Which of the following is not linear ? Show Answer


Q160) Oleum is Show Answer


Q161) Oxygen will directly react with each of the following element except. Show Answer


Q162) What is the product formed when ozone reacts with mercury ? Show Answer


Q163) Ozone is formed in the upper atmosphere from oxygen by the action of Show Answer


Q164) An example of a neutral oxide is Show Answer


Q165) Atomicity of sulphur in rhombic sulphur is Show Answer


Q166) Which of the following species is basic and reducing ? Show Answer


Q167) Which of the following oxoacids of sulphur contain sulphur -sluphur double bond ? Show Answer


Q168) Which of the following molecule exists as a cyclic trimer in the solid state ? Show Answer


Q169) The number of S-S bonds in the cyclic trimer of sulphur trioxide is Show Answer


Q170) Which of the following acids is not a peroxo acid ? Show Answer


Q171) Elements of group 16 (except polonium) are called chalcogens because Show Answer


Q172) Which of the following statement is correct ? Show Answer


Q173) The oxidation number of sulphur i the cyclic trimer of sulphur trioxide is Show Answer


Q174) The acid used in lead storage cells is Show Answer


Q175) Which of the following has the highest dipole moment ? Show Answer


Q176) The type of hybridization in water molecule is Show Answer


Q177) Which of the following has the least bond angle? Show Answer


Q178) The number of unpaired electron in the p-subshell of oxygen atom Show Answer


Q179) Which has maximum number of oxo group ? Show Answer


Q180) Which of the following has the largest ionic size ? Show Answer


Q181) Which of the following isoelectronic ions has the lowest ionization energy ? Show Answer


Q182) Which of the following hydrides has the lowest boiling point ? Show Answer


Q183) The number of dative bonds in sulphuric acid molecule is Show Answer


Q184) Oleum is chemically known as Show Answer


Q185) In the manufacturing of sulphuric acid by contact process, tyndall box is used to Show Answer


Q186) A colourless gas with smell of rotten fish is Show Answer


Q187) In which of the following, the oxidation number of sulphur is -1 ? Show Answer


Q188) Structure of thiosulphuric acid is Show Answer


Q189) The structure of the tetrathionate ion is Show Answer


Q190) The structure of dithionate ion is Show Answer


Q191) The structure of oleum is Show Answer


Q192) All the following decompose easily on heating to give oxygen except Show Answer


Q193) Sulphuric has great affinity for water because Show Answer


Q194) When a colourless gas is passed through bromine water only decolourisation takes place. The gas is Show Answer


Q195) Which of the following is not a reducing agent ? Show Answer


Q196) Of the following set which one does not contain isoelectronic species ? Show Answer


Q197) Which one of the following is an amphoteric oxide ? Show Answer


Q198) A gas which cannot be collected over water is Show Answer


Q199) The compound which gives off oxygen on moderate heating is Show Answer


Q200) The first ionization potential in electron volts of nitrogen and oxygen atoms are respectively given by Show Answer


Q201) Hydrolysis of one mole of peroxodisulphuric acid produces Show Answer


Q202) The acid having O-O bond is Show Answer


Q203) There is no S-S bond in Show Answer


Q204) Which shows polymorphisum ? Show Answer


Q205) Number of bonds in sulphuric dioxide is Show Answer


Q206) Caro's acid is Show Answer


Q207) Sulphur in +3 oxidation state is present in Show Answer


Q208) Which of the following is monoatomic ? Show Answer


Q209) Noble gases do not react with other element because Show Answer


Q210) Least chemical activity is shown by Show Answer


Q211) Which of the following fluorides of xenon is impossible ? Show Answer


Q212) Which of the following has zero valency? Show Answer


Q213) A clathrate may be defined as a Show Answer


Q214) The most abundant noble gas found in atmosphere is Show Answer


Q215) The last member of the family of inert gases is Show Answer


Q216) Which of the following is the correct sequence of the noble gases in their group in the period table? Show Answer


Q217) The element which occupy the peaks of ionization energy curve are Show Answer


Q218) The noble gas lighter than air is Show Answer


Q219) Which of the following two are isostructural ? Show Answer


Q220) Noble gases are a group of element which exhibit very Show Answer


Q221) Which one of the following is correct pair with respect to molecular formula of xenon compound and hybridization state of xenon in it? Show Answer


Q222) Argon was discovered by Show Answer


Q223) Which of the following is not correct ? Show Answer


Q224) Which of the following outer electronic configuration represent argon ? Show Answer


Q225) The spectrum of helium is expected to be similar to that of Show Answer


Q226) Percentage of Ar in air is about Show Answer


Q227) Which of the following statement is not true about noble gases ? Show Answer


Q228) Number of unpaired electron in inert gas is Show Answer


Q229) Which of the following cannot be formed ? Show Answer


Q230) The lowest boiling point of helium is due to its Show Answer


Q231) What are the products formed in the reaction of xenon hexafluoride with silicon dioxide ? Show Answer


Q232) The correct order of solubility in water for He, Ne, Ar, Kr and Xe is Show Answer


Q233) If one litre of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume takes place, the volume finally obtained would be approximately Show Answer


Q234) The density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by a chemical reaction from a compound of nitrogen due to the presence of the following in aerial nitrogen Show Answer


Q235) The atomic mass of noble gases is determined with the help of the following relationship Show Answer


Q236) The forces acting between noble gas atoms are Show Answer


Q237) Which of the following statement about noble gases is false ? Show Answer


Q238) The noble gas forming maximum number of compounds in Show Answer


Q239) In the following four element, the ionization potential of which one is the highest ? Show Answer


Q240) Sea divers go deep in the sea water with a mixture of which of the following gases? Show Answer


Q241) The coloured discharge tubes for advertisement mainly contain Show Answer


Q242) Which one of the following element is most reactive ? Show Answer


Q243) What is the atomic number (Z) of the noble gas that reacts with fluorine ? Show Answer


Q244) Which noble gas is most soluble in water ? Show Answer


Q245) Which of the following noble gas has highest polarizability ? Show Answer


Q246) Which of the following is an inert gas ? Show Answer


Q247) In the clathrates of xenon with water, the nature of bonding between xenon and water molecule is Show Answer


Q248) Which element out of He, Ar, Kr and Xe forms least number of compound? Show Answer


Q249) Which is a planar molecule? Show Answer


Q250) The fluoride of xenon with zero dipole moment is Show Answer


Q251) Which of the following noble gases is the least polarized ? Show Answer


Q252) Noble gases are difficult to liquefy because their Show Answer


Q253) Which of the following statement is incorrect ? Show Answer


Q254) Helium is suitable for low temperature gas thermometry because of its Show Answer


Q255) Which of the following is superfluid ? Show Answer


Q256) The noble gas which forms interstitial compound with metals is Show Answer


Q257) The noble gas commonly used in cryogenic study is Show Answer


Q258) Which of the following noble gas is radioactive in nature ? Show Answer


Q259) Which species is not known ? Show Answer


Q260) Noble gases can be separated by Show Answer


Q261) Xenon best reacts with Show Answer


Q262) The compound that attacks pyrex glass is Show Answer


Q263) Noble gases do not occur in Show Answer


Q264) Liquid flow from a higher to a lower level. Which of the following liquid can climb up the wall of the glass vessel in which it is placed ? Show Answer


Q265) The ease of liquefaction of noble gases decrease in the order Show Answer


Q266) B.p.t and m.p.t of inert gases are Show Answer


Q267) Which statement is correct ? Show Answer


Q268) Helium-oxygen is mixture used by deep sea divers in preference to nitrogen-oxygen mixture because Show Answer


Q269) Among the noble gases (From He to Xe) only xenon reacts with fluorine to form stable xenon fluorides because xenon Show Answer


Q270) The value of ionization potential for inert gases is Show Answer


Q271) The noble gas was first time discovered by Show Answer


Q272) Which of the following noble gases is not present in atmosphere ? Show Answer


Q273) Which of the following statement is not correct for a noble gas? Show Answer


Q274) Which of the following noble gases does not have an octet of electron in its outermost shell? Show Answer


Q275) Gradual addition of electronic shell in the noble gases causes a decrease in their Show Answer


Q276) The noble gas which was discovered first in the sun and then on the earth Show Answer


Q277) In which of the following groups, when helium is placed, all its properties are satisfied ? Show Answer


Q278) Which one of the following statement regarding helium is incorrect? Show Answer


Q279) Asthma patients use a mixture of ....... for respiration Show Answer


Q280) Which one of the following reactions of xenon compounds not feasible? Show Answer


Q281) Sea weeds are important source of Show Answer


Q282) Bromine is obtained on a commercial scale from Show Answer


Q283) In which of the following, oxygen has +2 oxidation number Show Answer


Q284) Bad conductor of electricity is Show Answer


Q285) Which of the following is the strongest oxidizing agent? Show Answer


Q286) Iodine readily dissolves in potassium iodine solution giving Show Answer


Q287) Hydrogen fluoride is liquid unlike other hydrogen halides because Show Answer


Q288) Oxidizing action increases in the following order Show Answer


Q289) Which has the highest molar heat of vaporization? Show Answer


Q290) Which of the following bonds will be most polar? Show Answer


Q291) Which one of the following can be purified by sublimation? Show Answer


Q292) Hydrogen bonding does not play any role in boiling of Show Answer


Q293) Which one of the following sequences represents the correct increasing order of bond angles in the given molecules? Show Answer


Q294) Which one of the following elements can have both positive and negative oxidation state? Show Answer


Q295) The element which never acts as a reducing agent in a chemical reaction is Show Answer


Q296) The aqueous solution of which of the following has maximum pH? Show Answer


Q297) Which of the following represents calcium chlorite? Show Answer


Q298) The correct order of reactivity of halogens with alkalies in Show Answer


Q299) Which of the following reaction involves oxidation and reduction? Show Answer


Q300) The halogen that is most easily reduced is Show Answer


Q301) At room temperature, HCl is a gas while HF is a low boiling liquid. This is because Show Answer


Q302) Hydrogen bond is strongest in Show Answer


Q303) For electron affinity of halogens which of the following is correct? Show Answer


Q304) Which one of the following statements about halogens is correct? Show Answer


Q305) The isoelectronic pair is Show Answer


Q306) Mark the smallest atom. Show Answer


Q307) Iodine deficiency in diet is known to cause Show Answer


Q308) Bleaching powder is obtained by the action of chlorine gas and Show Answer


Q309) Which halogen is the most electrospositive? Show Answer


Q310) Bleaching powder reacts with a few drops of conc. HCl to give Show Answer


Q311) Correct order of the size of iodine species is Show Answer


Q312) Which of the following arrangement for the three halogens Cl, Br and I when placed in the order of their increasing electron affinity is correct? Show Answer


Q313) Which statement is correct about halogens? Show Answer


Q314) Elements of which of the following groups will form anions most readily? Show Answer


Q315) The correct sequence of arrangement of the following compounds in order of decreasing oxidation numbers of iodine is Show Answer


Q316) Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound? Show Answer


Q317) Which of the following is most basic? Show Answer


Q318) Which one of the following oxyacids of chlorine is the least oxidizing in nature? Show Answer


Q319) Which is the weakest acid out of HF, HCl, HBr and HI? Show Answer


Q320) Which of the following cannot work as oxidising agent? Show Answer


Q321) Chlorine is liberated when we heat Show Answer


Q322) Which of the following is used in the preparation of chlorine? Show Answer


Q323) Freon is used as a Show Answer


Q324) Which of the following is incorrect with respect to property indicated? Show Answer


Q325) Which of the following elements shows different oxidation states? Show Answer


Q326) What is the oxidation state of chlorine in hypochlorous acid? Show Answer


Q327) Which one of the following halogen liberates oxygen, when passed through hot concentrated KOH solution? Show Answer


Q328) "Fluorosis" disease is caused due to the reaction of ........ With excess of fluoride in the body Show Answer


Q329) The set with correct order of acidity is Show Answer


Q330) Iodine can exist in the oxidation states Show Answer


Q331) Which one of the halogen acid is a liquid? Show Answer


Q332) Euchlorine is a mixture of Show Answer


Q333) Which of the following halogen oxides is ionic? Show Answer


Q334) Which of the following is a false statement? Show Answer


Q335) The bleaching action of chlorine is due to Show Answer


Q336) Strongest hydrogen bonding is shown by Show Answer


Q337) Which of the following sets has strongest tendency to form anions? Show Answer


Q338) Charge distribution in iodine mono-chloride is best represented as Show Answer


Q339) Which among the following is paramagnetic? Show Answer


Q340) Which of the following is not the characteristic of interhalogen compounds? Show Answer


Q341) Which of the following halogen does not exhibit positive oxidation state in its compounds? Show Answer


Q342) Which bond is most polar? Show Answer


Q343) Which of the following sets gives the correct arrangement of the compounds involved based on their bond strengths? Show Answer


Q344) Which of the following elements exhibits the most basic properties? Show Answer


Q345) Dilute hydrochloric acid solution cannot be concentrated by boiling beyond Show Answer


Q346) The compounds used as gaseous insulators in high voltage generators is Show Answer


Q347) Which of the following acid is weakest? Show Answer


Q348) Which one of the following is the true covalent oxide of iodine? Show Answer


Q349) As the atomic number of halogens increases, the halogens Show Answer


Q350) The type of bonding in HCl molecule is Show Answer


Q351) Which of the following species has four lone pairs of electrons? Show Answer


Q352) When chlorine is passed over dry slaked lime at room temperature, the main reaction product is Show Answer


Q353) A solution of potassium bromide is treated with each of the following. Which one would liberate bromine? Show Answer


Q354) An element has an atomic mass 19 and atomic number 9. Its ion is represented by Show Answer


Q355) Fluorine does not show positive oxidation states due to the absence of Show Answer


Q356) Electrolysis of brine produces Show Answer


Q357) Which of the following compounds is the strongest fluorideion acceptor? Show Answer


Q358) Which of the following is arranged in order of increasing ionic character? Show Answer


Q359) Which of the following statements is correct? Show Answer


Q360) Which of the following interhalogens does not exist? Show Answer


Q361) Which of the following statements is correct? Show Answer


Q362) Certain ions, with properties similar to halide ions, have two or more atoms of which at least one is nitrogen. Such ions are called Show Answer


Q363) Which of the following is not a pseudohalide ion? Show Answer


Q364) Chlorine can be manufactured by the oxidation of HCl in air by Show Answer


Q365) The ionic character of the metal-halogen bond (M - X) in metal halides decreases in the order Show Answer


Q366) Hydrofluoric acid cannot be stored in glass vessels because it reacts with glass to form Show Answer


Q367) Which of the following shows the arrangement of halide ions in increasing order of reducing property? Show Answer


Q368) Which of the following is not linear? Show Answer


Q369) Which of the following has greatest reducing power? Show Answer


Q370) Which of the following halogens does not from oxyacids? Show Answer


Q371) Which of the following pairs is not correctly matched? Show Answer


Q372) Chlorine cannot displace Show Answer


Q373) Unlike other halogens, fluorine does not show higher oxidation states because Show Answer


Q374) Which of the following belongs to the halogen family? Show Answer


Q375) Fluorine is a stronger oxidizing agent than chlorine in aqueous solution. This is attributed to many factors except Show Answer


Q376) Which of the following halogens has metallic character? Show Answer


Q377) Among F, Cl, Br, and I the lowest ionization potential will be of Show Answer


Q378) The electronegativity follows the order Show Answer


Q379) The electron affinity of the halogens follows the order Show Answer


Q380) The one with the largest size is Show Answer


Q381) Which of the following is the strongest acid? Show Answer


Q382) Halogen which can be prepared from caliche is Show Answer


Q383) Among the halogens, the one which is oxidized by nitric acid is Show Answer


Q384) A greenish yellow gas reacts with an alkali metal hydroxide to form a halite which can be used in fire works and safety matches. The gas and halite respectively are Show Answer


Q385) Which of the following is used as an antiseptic? Show Answer


Q386) Which of the following pairs will give chlorine gas most quickly upon reaction? Show Answer


Q387) Which of the following is most volatile? Show Answer


Q388) Which of the following has the stronger bond? Show Answer


Q389) Which has the highest bond energy? Show Answer


Q390) Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that Show Answer


Q391) The correct order of the thermal stability of hydrogen halides (H - X) is Show Answer


Q392) Which of the following is most stable to heat? Show Answer


Q393) Chlorine acts as bleaching agent only in presence of Show Answer


Q394) Bromine can be liberated from potassium bromide solution by the action of Show Answer


Q395) Which of the following is the strongest acid? Show Answer


Q396) The element which exist/s in the liquid state is / are Show Answer


Q397) The halogen which is most easily reduced is Show Answer


Q398) Which one of the following species is not a pseudohalide? Show Answer


Q399) The correct order of acidic strength is Show Answer


Q400) Which species has the maximum number of lone pair of electrons on the central atom? Show Answer


Q401) Identify the incorrect statement among the following. Show Answer


Q402) Increasing order of acid strength of halogen acid is Show Answer


Q403) Solubility of iodine in water may be increased by adding Show Answer


Q404) The correct order of pseudohalide, polyhalide and interhalogen are Show Answer


Q405) Which can do glass etching? Show Answer


Q406) Which is strongest acid? Show Answer


Q407) What products are expected from the disproportionation reaction of hypochlorous acid? Show Answer


Q408) Which one of the following configuration represents a noble gas? Show Answer


Q409) Which halogen do not form polyhalide ion? Show Answer


Q410) Oxygen is manufactured by fractional distillation of: Show Answer


Q411) Which is not the property of nitrogen? Show Answer


Q412) Which metal loses its meniscus after reaction with ozone? Show Answer


Q413) The two electrons in helium atom: Show Answer


Q414) Which of the following is not tetrahedral? Show Answer


Q415) Clathrates are Show Answer


Q416) Two pungent smelling gases bleach a certain substance. The gases may be: Show Answer


Q417) NaOH can absorb : Show Answer


Q418) Nitrogen is an essential constituent of all: Show Answer


Q419) The electron affinity of halogens shows the order: Show Answer


Q420) Mark the halogen which shows electropositive character: Show Answer


Q421) On heating ozone its volumes: Show Answer


Q422) Which of the following is called Berthelot's salt? Show Answer


Q423) A compound which leaves behind no residue on heating is: Show Answer


Q424) Phosphine on reaction with hydrobromic acid gives: Show Answer


Q425) Bleaching powder has the molecular formula: Show Answer


Q426) Which of the following is pseudohalogen? Show Answer


Q427) Six volumes of oxygen, on complete ozonisation, form …. Volumes of ozone. Show Answer


Q428) The decreasing order of b.p. or m.p. of halogens is: Show Answer


Q429) Ozonization of water is carried out to remove: Show Answer


Q430) Iodine solution stained on clothes can be removed by: Show Answer


Q431) Nitrogen (I) oxide is produced by: Show Answer


Q432) Welding of magnesium can be done in an atmosphere of Show Answer


Q433) Which noble gas is not found in atmosphere? Show Answer


Q434) An inorganic compound producing organic compound on heating is: Show Answer


Q435) The substance which does not liberate oxygen on treatment with ozone is Show Answer


Q436) Formula of calcium chlorite is: Show Answer


Q437) The gas not absorbed by coconut charcoal is Show Answer


Q438) Lead nitrate on heating gives lead oxide, nitrogen dioxide and oxygen. The reaction is known as: Show Answer


Q439) A black sulphide when treated with ozone becomes white. The white compound is: Show Answer


Q440) Which hydride is the strongest base? Show Answer


Q441) Which forms maximum compounds with xenon? Show Answer


Q442) Claude's process is used in the manufacture of: Show Answer


Q443) Sulphur on oxidation with hot sulphuric acid gives: Show Answer


Q444) Which is a saline oxide? Show Answer


Q445) Which set of elements has the strong tendency to form anions? Show Answer


Q446) Which loses weight on exposure to the atmosphere? Show Answer


Q447) The correct order of heat of formation of halogen acids is? Show Answer


Q448) Light blue colour of nitrous acid is due to dissolved: Show Answer


Q449) The number of P-O-P bridges in the structure of phosphorus pentoxide and phosphorus trioxide are respectively Show Answer


Q450) Rhombic and monoclinic sulphur are: Show Answer


Q451) Which one of the following pairs of reactants does not form oxygen when they react with each other? Show Answer


Q452) Oxide of a non-metal possesses the following characteristics:
(i) It is both a proton donor and proton acceptor.
(ii) It is poor conductor of electricity.
(iii) It reacts readily with basic and acidic oxides.
(iv) It oxidses Fe at boiling point.
The oxide is: Show Answer


Q453) Which of the following is a metalloid? Show Answer


Q454) Which of the following is more acidic in nature? Show Answer


Q455) The weakest acid is Show Answer


Q456) Most unstable hydride is Show Answer


Q457) Which element is most metallic? Show Answer


Q458) Concentrated nitric acid reacts with iodine to give: Show Answer


Q459) Phosphide ion has the electronic structure similar to that of: Show Answer


Q460) Electron affinity for a noble gas is approximately equal to: Show Answer


Q461) The gaseous mixture used by deep sea divers for respiration is: Show Answer


Q462) A gas that cannot be collected over water is Show Answer


Q463) Which is used in the manufacture of safe matchsticks? Show Answer


Q464) Which of the following is not hydrolysed? Show Answer


Q465) The m. p. and b. p. is lowest for: Show Answer


Q466) Chlorine, bromine and iodine are placed in the seventh group of the periodic table because: Show Answer


Q467) Nitric acid whether diluted or concentrated: Show Answer


Q468) An element belongs to group 15 and third period of the periodic table. Its electronic configuration will be Show Answer


Q469) The number of p-electrons in bromine atom is: Show Answer


Q470) The reagent used for testing ammonia is: Show Answer


Q471) Which species has the largest dipole moment? Show Answer


Q472) Elements of nitrogen family having allotropic forms are: Show Answer


Q473) An example of tetrabasic acid is: Show Answer


Q474) Nitrogen can be purified from the impurities of oxides of nitrogen and ammonia by passing through: Show Answer


Q475) Which statement is correct? Show Answer


Q476) Calcium phosphide is: Show Answer


Q477) Phosphoric acid is syrupy liquid due to: Show Answer


Q478) Which of the following inert gas liquefies easily? Show Answer


Q479) Nitric acid may be kept in a bottle of: Show Answer


Q480) Which is not poisonous? Show Answer


Q481) In sulphate ion the oxidation state of sulphur is +6 and the hybridization state of sulphur is: Show Answer


Q482) The least stable hydride of 15th group elements is Show Answer


Q483) Which of the light effective in the formation of chlorophyll? Show Answer


Q484) Which of the following is an explosive compound? Show Answer


Q485) The element evolving two different gases on reaction with conc. Sulphuric acid is Show Answer


Q486) Which statement is correct? Show Answer


Q487) The noble gas which forms maximum number of compounds is Show Answer


Q488) The most abundant element in the earth crust is Show Answer


Q489) Blasting of TNT is done by mixing it with: Show Answer


Q490) Man dies, when nitrous oxide is inhaled in large quantities because it: Show Answer


Q491) The most reactive allotropic form of phosphorus is: Show Answer


Q492) Nitrogen gas is absorbed by: Show Answer


Q493) The strongest acid amongst the following is Show Answer


Q494) ….. liberates oxygen from water. Show Answer


Q495) The hydroxide of which metal is soluble in excess of ammonia: Show Answer


Q496) Which group is called buffer group of the periodic table? Show Answer


Q497) Gradual addition of electronic shells in the noble gases causes a decrease in their Show Answer


Q498) Sodium pyrophosphate is represented by which of the following formula? Show Answer


Q499) Colour of iodine solution is disappeared by shaking it with aqueous solution of Show Answer


Q500) S—S bond is not present in Show Answer


Q501) Sequence of acidic character is: Show Answer


Q502) Phosphorus is manufactured by heating …… in a furnace. Show Answer


Q503) A radioactive element is: Show Answer


Q504) Which of the following(s) when heated give nitrogen gas? Show Answer


Q505) Metalloid among the following is: Show Answer


Q506) Which oxide of nitrogen is coloured gas? Show Answer


Q507) Ozone is readily dissolved in: Show Answer


Q508) The basic character of hydrides of the V-group elements decreases in the order Show Answer


Q509) Consider the following compounds:
1. Sulphur dioxide
2. Hydrogen peroxide
3. Ozone
Among these compounds identify those that can act as bleaching agent. Show Answer


Q510) Different allotropic forms of sulphur differ in: Show Answer


Q511) Phosphorus compound used as drying agent and desiccating agent is: Show Answer


Q512) Monoatomic element of nitrogen family is: Show Answer


Q513) Which noble gas was first of all detected in solar chromosphere? Show Answer


Q514) How many bonding electron pairs are there in white phosphorus? Show Answer


Q515) Which of the following does not react with fluorine? Show Answer


Q516) Which of the following causes damage to the building containing calcium and responsible for cough and choking in human? Show Answer


Q517) The acid used in lead storage battery is: Show Answer


Q518) Halogen used in the preparation of insecticides is: Show Answer


Q519) Which halogen acid is a liquid? Show Answer


Q520) Halon-1301 is Show Answer


Q521) The pair of species having identical shape for molecules of both species is Show Answer


Q522) Which molecule does not possess distorted geometry? Show Answer


Q523) Iodine displaces chlorine from which one of the compounds? Show Answer


Q524) Which member of oxygen family has the highest catenation ability? Show Answer


Q525) The noble gas used in the preparation of first noble gas compound was: Show Answer


Q526) On heating ammonium dichromate, the gas evolved is: Show Answer


Q527) Regular use of which of the following fertilizers increases the acidity of soil? Show Answer


Q528) Nitric oxide is: Show Answer


Q529) Mark the wrong statement. Halogens are all coloured. Show Answer


Q530) Which reaction can be used to prepare phosphoric acid? Show Answer


Q531) The last member of inert gas family is: Show Answer


Q532) Which gas is filled in electric bulbs/tubes? Show Answer


Q533) Helium–oxygen mixture is used by deep by sea divers in preference to nitrogen oxygen mixture because Show Answer


Q534) Iodine is formed when potassium iodide reacts with a solution of Show Answer


Q535) Among the fluorides below, the one which does not exist is Show Answer


Q536) The percentage of nitrogen in air remains almost constant due to: Show Answer


Q537) The bleaching action of bleaching powder is due to Show Answer


Q538) Which noble gas has highest and least polarisability respectively? Show Answer


Q539) The metal which does not form ammonium nitrate by reaction with dilute nitric acid is Show Answer


Q540) Nitrolim, a nitrogeneous fertilizer, is: Show Answer


Q541) The deficiency of iodine in diet causes Show Answer


Q542) Which noble gas is more soluble in water? Show Answer


Q543) Liquid oxygen is: Show Answer


Q544) Which statement about noble gases is not correct? Show Answer


Q545) Noble gases are group of elements which exhibit very Show Answer


Q546) Ozone reacts with: Show Answer


Q547) The inert gas abundantly found in atmosphere is Show Answer


Q548) The reaction of chlorine with CO in the presence of sunlight gives: Show Answer


Q549) The mixture of noble gases is separated by: Show Answer


Q550) The boiling points of halogens increase with increase in molecular weight, it is because: Show Answer


Q551) The strongest oxidizing agent is: Show Answer


Q552) Increasing order of acid strengths of hydrogen halides is: Show Answer


Q553) Noble gases are sparingly soluble in water due to Show Answer


Q554) Which is monoatomic? Show Answer


Q555) Oxidation state exhibited by sulphur Show Answer


Q556) Which gas can be collected over water? Show Answer


Q557) The gases absorbed by alkaline pyrogallol and oil of turpentine respectively are: Show Answer


Q558) Ozone turns tetramethyl base paper: Show Answer


Q559) Aquaregia is a mixture of: Show Answer


Q560) Statement 1 : Helium is the only substance that can't be solidified at atmospheric pressure.
Statement 2 : The zero point energy of helium is very high. Show Answer


Q561) Statement 1 : The van der Waals' forces are directly proportional to the ionisation potentials.
Statement 2 : Van der Waals' forces increases as the size and diffuseness of the electron clouds increases. Show Answer


Q562) Number of hydroxyl groups present in pyrosulphuric acid is Show Answer


Q563) Statement 1 : Red phosphorus is less volatile than white phosphorus.
Statement 2 : Red phosphorus has a discrete tetrahedral structure. Show Answer


Q564) Which is not an acid salt? Show Answer


Q565) Statement 1 : The ionization energy of gallium remains nearly same as that of aluminium.
Statement 2 : This is due to shielding of outer shell electrons form the nucleus by the d electrons of gallium. Show Answer


Q566) In fisher-Ringe's method of separation of noble gas mixture from air, ………. Is used. Show Answer


Q567) A colourless gas on passing through bromine water decolourises it. The gas is: Show Answer


Q568) In the manufacture of sulphuric acid by contact process, tyndall box is used to Show Answer


Q569) The oxide insoluble in water is: Show Answer


Q570) Which indicates the common laboratory method for the preparation of chlorine? Show Answer


Q571) Chlorine acts as a bleaching agent only is presence of Show Answer


Q572) Which one of the following pentafluorides cannot be formed? Show Answer


Q573) Which of the following has highest proton affinity? Show Answer


Q574) Nuclear fusion produces: Show Answer


Q575) In the dewar's method of separation of noble gases, the mixture of noble gases is kept in contact with coconut charcoal at 173 k . Which one of the following gaseous mixtures is not adsorbed on to the charcoal? Show Answer


Q576) The X—X bond dissociation energy is minimum in: Show Answer


Q577) Which is soluble in water? Show Answer


Q578) The oxidation state of N is highest in: Show Answer


Q579) Formula of rhombic Sulphur is: Show Answer


Q580) The noble gases are unreactive because they: Show Answer


Q581) Phosphine reacts with copper sulphate solution to form: Show Answer


Q582) Desicchlora is Show Answer


Q583) Who among the following first prepared a stable compound of noble gas? Show Answer


Q584) Colour of iodine solution can be discharged by shaking it with aqueous solution of: Show Answer


Q585) Which of the following is called stranger gas? Show Answer


Q586) Sulphuric acid has great affinity for water because Show Answer


Q587) Major credit for the discovery of noble gases is given to: Show Answer


Q588) Noble gases possess: Show Answer


Q589) What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid? Show Answer


Q590) A green yellow gas reacts with an alkali metal hydroxide to form a halate which can used in fireworks and safety matches. The gas and halate respectively are Show Answer


Q591) When plants and animals decay, the organic nitrogen is converted into inorganic nitrogen Show Answer


Q592) Which of the following species is not a pseudohalide? Show Answer


Q593) Sulphur is soluble in: Show Answer


Q594) Which of the following is formed by xenon? Show Answer


Q595) The oxide which is solid at room temperature is: Show Answer


Q596) Which hydride possesses the maximum complex forming nature? Show Answer


Q597) Bad conductor of electricity is: Show Answer


Q598) The van der Waals' forces in halogens decrease in the order: Show Answer


Q599) With cold and dilute sodium hydroxide fluorine reacts to give Show Answer


Q600) Which hydride does not exist? Show Answer


Q601) Ozone is formed by the interaction of water with: Show Answer


Q602) Which reaction is not valid? Show Answer


Q603) The lattice energy of lithium halides in the following order Show Answer


Q604) Iodine readily dissolves in potassium iodide solution giving Show Answer


Q605) Which one of the following is not true at room temperature and pressure? Show Answer


Q606) Which of the following acid posses oxidising, reducing and complex forming properties? Show Answer


Q607) Ammonium chloride is removed from its mixture by: Show Answer


Q608) White smoke is formed when ammonia gas meets with: Show Answer


Q609) The acid used in soft drinks is: Show Answer


Q610) Which of the elements of group VA does not show allotropy? Show Answer


Q611) In the electrothermal process, the compound displaced by silica from calcium phosphate is Show Answer


Q612) It is possible to obtain oxygen from air by fractional distillation because: Show Answer


Q613) Which is most basic of the following oxides? Show Answer


Q614) Which is stronger acid? Show Answer


Q615) Ammonia on reaction with hypochlorite anion, can form Show Answer


Q616) Which of the following compounds do not exist? Show Answer


Q617) Oxidation of ammonia by CuO yields: Show Answer


Q618) The correct order for decreasing acidic strength of oxoacids of gp.15 is: Show Answer


Q619) For chrome plating the electrolytic bath contains: Show Answer


Q620) Chlorine gas can be dried by passing over: Show Answer


Q621) At T (K), 100 L of dry oxygen is present in a sealed container. It is subjeceted to silent electric discharge, till the volumes of oxygen and ozone becomes equal .what is the volume of ozone formed at T (K)? Show Answer


Q622) What is the correct order of occurrence (% by weight) in air of Ne, Ar and Kr? Show Answer


Q623) The source of most of the noble gases is: Show Answer


Q624) Paramagnetic oxide of chlorine is : Show Answer


Q625) Pure HBr gas may be obtained by heating sodium bromide with syrupy phosphoric acid and not with concentrated sulphuric acid because concentrated sulphuric acid is: Show Answer


Q626) Fertilizer having the highest nitrogen percentage is: Show Answer


Q627) The first noble gas compound obtained was: Show Answer


Q628) Which one of the following represents noble gas configuration? Show Answer


Q629) There is no S−S bond is Show Answer


Q630) Sulphurous acid can be used as: Show Answer


Q631) The ease of liquefaction of noble gases decreases in the order: Show Answer


Q632) Decreasing order of reducing power of hydrogen halides is : Show Answer


Q633) Which one of the following reacts with glass? Show Answer


Q634) Super halogen is: Show Answer


Q635) The gas which is supporter of combustion is: Show Answer


Q636) The halide that cannot act as Lewis acid is: Show Answer


Q637) Which gives off oxygen on moderate heating? Show Answer


Q638) Which is the true covalent oxide of iodine? Show Answer


Q639) Which element out of He, Ar, Kr and Xe forms least number of compounds? Show Answer


Q640) Nitrogen does not combine directly with: Show Answer


Q641) Which of the following is the strongest oxidizing agent? Show Answer


Q642) Approximately what percentage of air by volume gets used in a process of combustion? Show Answer


Q643) In case of halogen family, which trend occurs as the atomic number increases? Show Answer


Q644) What is the product formed when phosphorus trioxide is dissolved in water? Show Answer


Q645) Xenon directly combines with: Show Answer


Q646) The last orbit of argon would have electrons Show Answer


Q647) Phosphine is not evolved when: Show Answer


Q648) The acidic nature of HF can be increased in presence of: Show Answer


Q649) Identify the incorrect statement among the following : Show Answer


Q650) Which of the following oxides are acidic? Show Answer


Q651) The pentavalence in phosphorus is more stable as compared to that of nitrogen even though they belong to the same group. It is due to Show Answer


Q652) With excess of chlorine, ammonia forms: Show Answer


Q653) Which of the following is kept in water? Show Answer


Q654) The formula of iodine acetate is: Show Answer


Q655) The anhydride of hypochlorous acid is: Show Answer


Q656) Anhydrone is: Show Answer


Q657) Thermal stability of hydrogen halide follows the order: Show Answer


Q658) The correct order of boiling points of the hydrides of nitrogen family is Show Answer


Q659) In which process sulphur is not used? Show Answer


Q660) When the mineral clevite is heated, it give off the inert gas Show Answer


Q661) Iodine is fromed when KI reacts with solution of Show Answer


Q662) Used as desiccant. Show Answer


Q663) Oxygen is not readily reacted with Show Answer


Q664) The strongest reducing agent among the following is Show Answer


Q665) Most acidic oxide among the following is Show Answer


Q666) Which one has the highest bond energy? Show Answer


Q667) Liquid flow from a higher to a lower level. Which of the following liquids can climb up the wall of the glass
vessel in which it is placed? Show Answer


Q668) Pure nitrogen can be prepared from Show Answer


Q669) Fluorine can be free from HF by passing the mixture through: Show Answer


Q670) Which of the following noble gases is most reactive? Show Answer


Q671) Fluorine is usually obtained from: Show Answer


Q672) First stable compound of inert gas was prepared by: Show Answer


Q673) Mark the strongest acid Show Answer


Q674) Which is incorrect for bleaching powder? Show Answer


Q675) The strongest acidic oxide is: Show Answer


Q676) The most basic hydride is Show Answer


Q677) Phosphorus pentoxide cannot be used to dry: Show Answer


Q678) Apatite is an ore of Show Answer


Q679) Calcium cyanamide on treatment with steam produces Show Answer


Q680) A hydride of nitrogen having lowest oxidation number of N: Show Answer


Q681) Copper turnings when heated with concentrated sulphuric acid will give Show Answer


Q682) Chlorine acts as a bleaching agent only in presence of Show Answer


Q683) Swimming pools are disinfected by bubbling through water with a controlled quantity of: Show Answer


Q684) Chlorine water on cooling deposits greenish-yellow crystals of: Show Answer


Q685) Which inert gas have highest boiling point? Show Answer


Q686) A glass tube containing molten antimony breaks upon solidification of antimony due to: Show Answer


Q687) Metaphosphoric acid is Show Answer


Q688) Which one of the following statements regarding helium is incorrect? Show Answer


Q689) Hydrogen bromide is dried by passing the gas through: Show Answer


Q690) By warming a paste of bleaching powder with a solution of ammonia, we get: Show Answer


Q691) The ion that cannot undergo disproportionation is: Show Answer


Q692) Which of the following is the most basic oxide? Show Answer


Q693) Phosphine is generally prepared in the laboratory? Show Answer


Q694) The correct order of acidic nature is: Show Answer


Q695) The most abundant inert gas in air is: Show Answer


Q696) The van der Waal’s forces are the greatest in: Show Answer


Q697) Which of the following hydrogen halides has the highest boiling point? Show Answer


Q698) Starch paper moistened with KI solution turns blue in ozone because of: Show Answer


Q699) Which of the following statement is not true? Show Answer


Q700) In which of the following chlorine is not used: Show Answer


Q701) The molecular formula of dithionic acid is Show Answer


Q702) Platinum, palladium and iridium are called noble metals because Show Answer


Q703) Bleaching powder is disinfectant for purification of water. When water born germs are killed. But disinfectant activity is destroyed. It is due to disproportion into Show Answer


Q704) Marshall's acid is: Show Answer


Q705) The correct order of pseudohalide ,polyhalide and interhalogen are Show Answer


Q706) The word neon signifies: Show Answer


Q707) Paramagnetic oxide is: Show Answer


Q708) Fluorosis disease is caused due to the reaction of …….. with excess of fluorine in the body. Show Answer


Q709) Which one is correct statement? Show Answer


Q710) Among the halogens, the one which is oxidised by nitric acid is Show Answer


Q711) Which has the lowest boiling point? Show Answer


Q712) The elements S, Se, Te can have two positive oxidation states. Which one of the following is correct? Show Answer


Q713) Which sulphide is used in the manufacture of "strike anywhere" matches? Show Answer


Q714) Liquid oxygen: Show Answer


Q715) The substance which is solid at room temperature forms ionic compounds and reacts with hydrogen forming a hydride, the aqueous solution of which is acidic, could be Show Answer


Q716) Oxide of nitrogen which is soluble in alcohol is: Show Answer


Q717) Ammonia water is a good cleaning agent because it: Show Answer


Q718) A clathrate is defined as a: Show Answer


Q719) The correct order of reducing abilities of hydrides of V group elements is Show Answer


Q720) Available chlorine is liberated from bleaching powder when it: Show Answer


Q721) Ordinary oxygen contains: Show Answer


Q722) A salt of sulphurous acid is called: Show Answer


Q723) Metal halide which is insoluble in water is Show Answer


Q724) Chlorine bleaches only in the: Show Answer


Q725) The sides of safety matches contains Show Answer


Q726) Phosphine is: Show Answer


Q727) Antimony dissolves in aquaregia to give: Show Answer


Q728) In the isolation of fluorine, a number of difficulties were encountered. Which statement is correct? Show Answer


Q729) Thomas slag is: Show Answer


Q730) Dinitrogen pentoxide a colourless solid is prepared by Show Answer


Q731) Which of the following elements is radioactive? Show Answer


Q732) Ammonium compound not used as a fertilizer is: Show Answer


Q733) Which one of the following reactions of Xenon compounds is not feasible? Show Answer


Q734) Javelle water is: Show Answer


Q735) Which one is most electronegative? Show Answer


Q736) The strongest acid is: Show Answer


Q737) Orthophosphoric acid on heating gives: Show Answer


Q738) The largest bond angle exists in: Show Answer


Q739) Increasing order of strength of oxo-acids of chlorine is: Show Answer


Q740) Which oxide is more acidic? Show Answer


Q741) The correct order of bond angles and stability of hydrides given below is: Show Answer


Q742) Which oxide do not act as a reducing agent? Show Answer


Q743) When chlorine reacts with dil. NaOH under cold conditions, the oxidation state of chlorine changes from zero to Show Answer


Q744) Fuming sulphuric acid is Show Answer


Q745) Yellow ammonium sulphide is: Show Answer


Q746) The weakest acid is: Show Answer


Q747) Sulphuric acid is used: Show Answer


Q748) The smell of nitrogen dioxide is: Show Answer


Q749) The gas obtained when urea reacts with nitrous acid is: Show Answer


Q750) Halogen used as an antiseptic is: Show Answer


Q751) Nitrous oxide Show Answer


Q752) The species that does not contain peroxide ion is Show Answer


Q753) The gas used for inflating the tyres of aeroplanes is: Show Answer


Q754) Fluorapatite is a mineral of: Show Answer


Q755) The element present in combined state in Laminaria stenophylla is: Show Answer


Q756) Least malleable and ductile metal is: Show Answer


Q757) Phosphine is prepared by the reaction of Show Answer


Q758) In the manufacture of bromine from sea water, the mother liquor containing bromide is treated with Show Answer


Q759) Which of the following does not react with AgCl? Show Answer


Q760) Which of the following is not correct? Show Answer


Q761) Which of the following equations is not correctly formulated? Show Answer


Q762) Laughing gas is prepared by heating Show Answer


Q763) A certain element forms a solid oxide which when dissolved in water forms an acidic solution. The element is: Show Answer


Q764) Which statement is not correct for nitrogen? Show Answer


Q765) The oxidizing property of nitric acid is due to: Show Answer


Q766) Which of the following acts as fluoro Lewis acids? Show Answer


Q767) The reaction showing endothermic nature and reduction of halogen is: Show Answer


Q768) A radioactive element X decays to give two inert gases. X is: Show Answer


Q769) Calcium carbide when heated with nitrogen forms: Show Answer


Q770) Hydrofluoric acid is not preserved in glass bottles because: Show Answer


Q771) Ammonia is: Show Answer


Q772) Schweitzer's reagent is: Show Answer


Q773) Sulphur on boiling with NaOH solution gives Show Answer


Q774) Which does not give oxygen on heating? Show Answer


Q775) Correct order of decreasing thermal stability is as Show Answer


Q776) Electronegativity of an inert gas is: Show Answer


Q777) Most electropositive halogen is: Show Answer


Q778) Good conductor of electricity is: Show Answer


Q779) Which of the following pairs is obtained on heating ammonium dichromate? Show Answer


Q780) Which of the following has S—S bond Show Answer


Q781) Which burns to form an oxide which is gas at room temperature? Show Answer


Q782) The crystals of ferrous sulphate on heating give: Show Answer


Q783) Helium was discovered by: Show Answer


Q784) The structure of orthophosphoric acid is Show Answer


Q785) Which one of the following reactions does not occur? Show Answer


Q786) Bleaching action of chlorine is due to: Show Answer


Q787) In clatherates of xenon with water, the nature of bonding between xenon and water molecule is Show Answer


Q788) Asthma patients use a mixture of…..for respiration. Show Answer


Q789) Which is an amphoteric oxide? Show Answer


Q790) Which requires catalyst? Show Answer


Q791) Anhydride of nitric acid is: Show Answer


Q792) Fluorine gas is stored in: Show Answer


Q793) Which of the following is used in very low temperature thermometers? Show Answer


Q794) Which of the following attacks glass: Show Answer


Q795) The noble gas forming maximum number of compound is Show Answer


Q796) Which property of white phosphorus is common to red P? Show Answer


Q797) Which one of the following statements is not true? Show Answer


Q798) Which one of the following pairs of substances when mixed, produces chlorine gas at room temperature? Show Answer


Q799) Which of the following elements is good conductor of electricity? Show Answer


Q800) Which of the following form of interhalogen compounds does not exists? Show Answer


Q801) Which one is true peroxide? Show Answer


Q802) When a colourless gas is passed through bromine water, decolourization takes place. The gas is: Show Answer


Q803) Which reaction is not feasible? Show Answer


Q804) The bonds present in pernitric acid are: Show Answer


Q805) In which of these processes platinum is used as a catalyst? Show Answer


Q806) A greenish yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fireworks and safety matches. The gas and halate respectively are: Show Answer


Q807) Correct statement about white phosphorus is: Show Answer


Q808) Ammonia reacts with excess of chlorine to form: Show Answer


Q809) The noble gas which can diffuse through rubber and glass easily is Show Answer


Q810) Sea-weeds are important sources of: Show Answer


Q811) CAN pellets are coated with calcium silicate because: Show Answer


Q812) Yellow phosphorus is kept in: Show Answer


Q813) When silver chloride dissolves in ammonia, it forms? Show Answer


Q814) Caro's acid is: Show Answer


Q815) Which one of the following has lowest bond dissociation energy? Show Answer


Q816) Ozone reacts with moist iodine giving: Show Answer


Q817) On heating sodium as well as sulphur can be melted. Molten sodium and molten sulphur are used as: Show Answer


Q818) Which of the following pairs has bleaching property? Show Answer


Q819) Which of the following is not a hydride? Show Answer


Q820) In froth floatation process for the purification of ores, the particles of ore float because Show Answer


Q821) The zero group members are collectively known as: Show Answer


Q822) Pnicogens are the elements of group? Show Answer


Q823) The percentage of available chlorine in a commercial sample of bleaching powder is: Show Answer


Q824) Which statement is false for ozone? Show Answer


Q825) Which oxide of chlorine is most powerful oxidizing agent? Show Answer


Q826) The electrolysis of brine solution to manufacture chlorine is carried out in the: Show Answer


Q827) The correct order of acidic strength is: Show Answer


Q828) Chlorous acid and its salts (chlorites) are: Show Answer


Q829) Antimony burns in chlorine to form: Show Answer


Q830) Ozone molecule has …….. geometry. Show Answer


Q831) Bromargyrite is a mineral of: Show Answer


Q832) Which is not true for ozone? Show Answer


Q833) Helium is used in gas balloons instead of hydrogen because: Show Answer


Q834) The oxidation states of phosphorus vary from: Show Answer


Q835) Which of the following is a mixed anhydride? Show Answer


Q836) The following elelment forms a molecule with eight of its own atoms Show Answer


Q837) Which does not give ammonia with water? Show Answer


Q838) Bond length is maximum in: Show Answer


Q839) The correct order of acidic nature of oxides is in the order Show Answer


Q840) Nitrogen molecule is chemically less active because it has a …… between two nitrogen atoms. Show Answer


Q841) Sulphur trioxide is dissolved in heavy water to form a compound X. The hydridisation of sulphur in X is Show Answer


Q842) Bleaching powder is mixed calcium salt of: Show Answer


Q843) Which noble gas does not form clathrates? Show Answer


Q844) Strongest reducing agent is: Show Answer


Q845) Bleaching properties of bleaching powder are due to its: Show Answer


Q846) One mole of calcium phosphide on reaction with excess water gives Show Answer


Q847) Most abundant element in earth's crust is: Show Answer


Q848) Which noble gas has the least tendency to form compounds? Show Answer


Q849) Which reaction yields the greatest quantity of chlorine from a given quantity of hydrochloric acid? Show Answer


Q850) Mixture used on tips of matchsticks is: Show Answer


Q851) Superphosphate of lime is Show Answer


Q852) In Birkeland and Eyde process, the temperature of the electric arc is about: Show Answer


Q853) Which element shows polymorphism? Show Answer


Q854) Select the correct statement. Show Answer


Q855) When Zn reacts with very dilute nitric acid it produces? Show Answer


Q856) Nitric acid is generally light yellow due to the presence of: Show Answer


Q857) The inert gases present in atmosphere are: Show Answer


Q858) Graham's salt is: Show Answer


Q859) Orthophosphoric acid is ionized in…….steps. Show Answer


Q860) Percentage of argon in air is about: Show Answer


Q861) Select the incorrect statement among the following Show Answer


Q862) Aqua fortis is: Show Answer


Q863) Which among the following is the strongest acid? Show Answer


Q864) Peroxy acids are Show Answer


Q865) The pale-yellow coloured gas is: Show Answer


Q866) What may be expected to happen, when phosphine gas is mixed with chlorine gas? Show Answer


Q867) Which of the following is a pseudohalogen? Show Answer


Q868) A substance X when heated with sulphuric acid liberates a gas which turns starch paper blue. The substance is: Show Answer


Q869) The formula of zinc phosphite is: Show Answer


Q870) How can you synthesise nitric oxide in the laboratory? Show Answer


Q871) Uranium isotopes are usually separated by using compounds of the halogen: Show Answer


Q872) By the action of concentrated hydrochloric acid on potassium chlorate we get this mixture of gases: Show Answer


Q873) For advertisement the coloured dischared tubes contain Show Answer


Q874) Ammonium salts are oxidized in the soil to nitrites by: Show Answer


Q875) Which reaction cannot be used for the preparation of the halogen acid? Show Answer


Q876) The principal source of helium is: Show Answer


Q877) Bleaching powder is a mixture of: Show Answer


Q878) Which gas is used to improve the atmosphere of crowded places? Show Answer


Q879) The chemical formula for tartar emetic is: Show Answer


Q880) Which is an essential trace element involved in physiology of thyroid glands? Show Answer


Q881) Iodine imparts brown colour to: Show Answer


Q882) Which coagulates white of an egg? Show Answer


Q883) Neon is extensively used in: Show Answer


Q884) The fluoride which does not exist is: Show Answer


Q885) Fluorine exhibits an oxidation state of only -1 because Show Answer


Q886) The solubility of iodine in water increases in presence of Show Answer


Q887) Sal volatile is: Show Answer


Q888) Which of the following is responsible for depletion of the ozone layer in the upper strata of atmosphere? Show Answer


Q889) Halogen acid used in the preparation of aqua regia is: Show Answer


Q890) Coloured oxide is nitrogen is: Show Answer


Q891) Bromine is liberated when an aqueous solution of KBr is treated with Show Answer


Q892) Which of the following is not a peroxy acid? Show Answer


Q893) Formation of ozonide is: Show Answer


Q894) Which reagent can separate nitric oxide from nitrous oxide? Show Answer


Q895) Which of the following is oxidised in air? Show Answer


Q896) Which statement is not correct? Show Answer


Q897) Which element does not form stable diatomic molecules? Show Answer


Q898) The anhydride of pyrosulphuric acid is: Show Answer


Q899) Ripening of fruits can be carried out in presence of Show Answer


Q900) Ozone oxidises moist sulphur to: Show Answer


Q901) Which is most thermodynamically stable allotropic form of phosphorus? Show Answer


Q902) Which one is strongest oxidizing agent? Show Answer


Q903) Dry bleaching is done by: Show Answer


Q904) Which is not an oxo-acid of chlorine? Show Answer


Q905) Which chemical contains chlorine? Show Answer


Q906) A greenish-yellow coloured gas is liberated on heating a mixture of two substances which are: Show Answer


Q907) What are the products obtained when ammonia is reacted with excess chlorine? Show Answer


Q908) The least stable anion of oxo-acids of chlorine is Show Answer


Q909) Non-combustible hydride is: Show Answer


Q910) In the known interhalogen compounds the maximum number of halogen atoms is: Show Answer


Q911) Which of the following is the life saving mixture for an asthma patient? Show Answer


Q912) Which species is not known? Show Answer


Q913) Which statement is wrong? Show Answer


Q914) Oxygen reacts with each of the following elements readily, except: Show Answer


Q915) Concentrated sulphuric acid can be reduced by Show Answer


Q916) Which form of P shows chemiluminescence? Show Answer


Q917) Phosgene is the name of: Show Answer


Q918) The idea which prompted Bartlett to prepare first ever compound of noble gas was: Show Answer


Q919) Correct order of electron affinities of halogens is Show Answer


Q920) The correct order of acidity of halogenic acids is Show Answer


Q921) Which of the following statements regarding sulphur is incorrect? Show Answer


Q922) Which of the following oxy-acids of phosphorus is a reducing agent and monobasic? Show Answer


Q923) Radon is a noble gas. Its radioactivity is used in the treatment of: Show Answer


Q924) On heating copper nitrate strongly ….. is finally obtained. Show Answer


Q925) Pearl white is: Show Answer


Q926) Which of the following dissolves in water but does not give any oxyacid solution? Show Answer


Q927) The nitrate which when heated gives-off a gas or a mixture of gases which cannot relight a glowing splinter is: Show Answer


Q928) Compounds formed when the noble gases get entrapped in the cavities of crystal lattices of certain organic and inorganic compounds are known as: Show Answer


Q929) The mineral clevite on heating gives: Show Answer


Q930) Bromine can be liberated from potassium bromide solution by: Show Answer


Q931) Which element is not considered as 'chalcogens'? Show Answer


Q932) When lead nitrate is heated it produces Show Answer


Q933) Which is the most easily liquefiable rare gas? Show Answer


Q934) The outermost electronic configuration of group 15 or VA elements is: Show Answer


Q935) The noble gas used in atomic reactor, is Show Answer


Q936) In modern process phosphorus is manufactured by: Show Answer


Q937) Which property is most important in making fluorine the strongest oxidising halogen? Show Answer


Q938) Which has maximum vapour pressure or most volatile or low b.p.? Show Answer


Q939) Which of the following halogen acids has the lowest melting point? Show Answer


Q940) Amphoteric oxide is: Show Answer


Q941) Bone black is polymorphic form of Show Answer


Q942) The lone pair present on N family hydrides more easily participates in bond formation in: Show Answer


Q943) Which element reacts with chlorine to give pentachloride? Show Answer


Q944) In which case, the order of acidic strength is not correct? Show Answer


Q945) Which compound does not has S—S bond? Show Answer


Q946) Compound of Sulphur used in electrical transformer is: Show Answer


Q947) The inert gases producing maximum number of compounds are Show Answer


Q948) The fertilizer named 'Nitrolim' is prepared by the use of: Show Answer


Q949) Noble gases are prepared by the: Show Answer


Q950) Sulphur trioxide can be obtained by which of the following reaction: Show Answer


Q951) When an aqueous solution of hypochlorite is heated: Show Answer


Q952) Xenon hexafluoride reacts with silica to form a xenon compound X. The oxidation state of xenon in X is Show Answer


Q953) The metallic form of phosphorus is: Show Answer


Q954) Sodium chromite is: Show Answer


Q955) Which one of the following reaction of xenon compounds is not feasible? Show Answer


Q956) Fixation of nitrogen means: Show Answer


Q957) A depolarizer used in dry batteries is: Show Answer


Q958) Liquor ammonia bottles are opened only after cooling because it has high vapour pressure and it is mild explosive. Show Answer


Q959) In oxo-acids of halogen, X = O bond is formed as a result of: Show Answer


Q960) Liquor ammonia is Show Answer


Q961) Which is the most volatile compound? Show Answer


Q962) Fuming nitric acid is: Show Answer


Q963) In ramsay and rayleigh's isolation of noble gases from air, the nitrogen of the air is finally converted into Show Answer


Q964) Superphosphate of lime is used in: Show Answer


Q965) Noble gases are: Show Answer


Q966) Nitric acid is used in the manufacture of : Show Answer


Q967) In halogen's group which elements has highest electron affinity? Show Answer


Q968) Which of the following is not obtained by direct reaction of constituent elements? Show Answer


Q969) The symbol Rn represent: Show Answer


Q970) Which halogens oxidises water to oxygen exothermally? Show Answer


Q971) The gas which is absorbed by ferrous sulphate solution giving blackish brown colour is: Show Answer


Q972) Ozone is used for purifying water because Show Answer


Q973) White phosphorus is Show Answer


Q974) In smoke screens calcium phosphide is used, because it: Show Answer


Q975) Nitrogen is a relatively inactive element because: Show Answer


Q976) Cold fire is related to Show Answer


Q977) Sides of match box have coating of Show Answer


Q978) The non-existent species is: Show Answer


Q979) The non-metallic element whose molecules contain maximum number of its atoms is: Show Answer


Q980) In Kroll and ICl process of the production of titanium, the inert gas used is: Show Answer


Q981) A positive chromyl chloride test is given by a salt containing: Show Answer


Q982) The following species will not exhibit disproportionation reaction Show Answer


Q983) Aqua-regia is Show Answer


Q984) Which halogen does not show bleaching property? Show Answer


Q985) Interhalogen compounds are more reactive than the individual halogen because: Show Answer


Q986) Arsine is: Show Answer


Q987) Which of the following isotopes is present in largest amount? Show Answer


Q988) Which has the highest molar heat of vaporization? Show Answer


Q989) Who observed helium first on the earth? Show Answer


Q990) Liquid ammonia is used for refrigeration because Show Answer


Q991) The number of different oxides of chlorine is: Show Answer


Q992) Boiling of dil. HCl acid does not increase its concentration beyond 20.24 per cent because hydrochloric acid: Show Answer


Q993) Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that: Show Answer


Q994) The gas which does not show oxidizing and bleaching properties is: Show Answer


Q995) Atomicity of phosphorus is: Show Answer


Q996) Ammonia is generally manufactured for fertilizers by the reaction: Show Answer


Q997) The group 15 or VA group elements are commonly known as: Show Answer


Q998) The M—Cl bond energies are different in: Show Answer


Q999) The oxidation of thiosulphate ion by iodine gives: Show Answer


Q1000) Which halide of nitrogen is least basic? Show Answer


Q1001) Most acidic oxide is: Show Answer


Q1002) King of chemicals is: Show Answer


Q1003) Fluorine is the best oxidising agent because it has Show Answer


Q1004) Which of the following compounds can not be stored in glass vessels? Show Answer


Q1005) Which bond has the greatest polarity? Show Answer


Q1006) Berthelot's salt is: Show Answer


Q1007) The strongest oxidizing agent among the following is: Show Answer


Q1008) Which is tribasic acid? Show Answer


Q1009) Which chloride is explosive? Show Answer


Q1010) All the elements of the oxygen family are: Show Answer


Q1011) As the number of —OH groups increases in hypophosphorus acid phosphorus acid and phosphoric acid the acidic strength Show Answer


Q1012) Nitric acid oxidizes sulphur to: Show Answer


Q1013) Which one is correct if HCl and HF are present together in liquid state? Show Answer


Q1014) Xenon tetrafluoride has hybridisation and structure as: Show Answer


Q1015) Red phosphorus is chemically unreactive because: Show Answer


Q1016) Which acid is not formed by the action of water on phosphorus pentoxide? Show Answer


Q1017) To make nitrogen dioxide free from oxygen it is passed through U-tube: Show Answer


Q1018) Tincture of iodine is: Show Answer


Q1019) Sulphur does not combine with which of the following halogens to form a compound? Show Answer


Q1020) Sulphurous anhydride is: Show Answer


Q1021) The percentage of ozone in ozonized oxygen is about: Show Answer


Q1022) The weakest acid among the following is: Show Answer


Q1023) Which is planar molecule? Show Answer


Q1024) White phosphorus may be separated from red phosphorus by: Show Answer


Q1025) What are the products formed in the reaction of xenon hexafluoride with silicon dioxide? Show Answer


Q1026) Mixture of sand and iodine can be separated by: Show Answer


Q1027) Ammonia is soluble in water because it is: Show Answer


Q1028) Sodium nitrate on heating with zinc dust and caustic soda gives: Show Answer


Q1029) Which one is least soluble in water? Show Answer


Q1030) Formula of iodine phosphate is: Show Answer


Q1031) Which of the following forms vortex ring? Show Answer


Q1032) When radioactive minerals like clevite, monazite and pitchblende are heated to 1273 k in vacuo the noble gas obtained is Show Answer


Q1033) Which acid on keeping for long time acquires brown colour? Show Answer


Q1034) Bacteria convert molecular nitrogen into: Show Answer


Q1035) Nitric acid (conc.) oxidizes phosphorus to: Show Answer


Q1036) Diamagnetic oxide of chlorine is: Show Answer


Q1037) Which of the following is the correct order of increasing enthalpy of vaporization? Show Answer


Q1038) The acidity of hydrides of O, S, Se, Te varies in the order Show Answer


Q1039) Which of the following was previously known as muriatic acid? Show Answer


Q1040) Which has the strongest bond? Show Answer


Q1041) When molten sulphur is suddenly cooled by pouring into water, it takes the form of Show Answer


Q1042) Which metal forms an amphoteric oxide? Show Answer


Q1043) Which of the following is anhydride of perchloric acid? Show Answer


Q1044) An element forms a gaseous oxide which on dissolving in water gives an acid solution. The element is: Show Answer


Q1045) When plants and animals decay the organic nitrogen is converted into inorganic nitrogen .The inorganic nitrogen in the form of Show Answer


Q1046) Minimum bond length will be in: Show Answer


Q1047) A certain compound when burnt gave three oxides. The first turned lime water milky, the second turned cobalt chloride paper pink and the third formed an aqueous solution of pH 3 nearly. The elements present in the compound are: Show Answer


Q1048) Anhydride of sulphuric acid is: Show Answer


Q1049) Which of the following has no action with starch solution? Show Answer


Q1050) The essential element of nitrogen fixation is: Show Answer


Q1051) Bleaching powder is an example of: Show Answer


Q1052) What may be expected to happen when phosphine gas is mixed with chlorine gas? Show Answer


Q1053) Iron sulphide is heated in air to form A. an oxide of sulphur. A is dissolved in water to give an acid. The basicity of this acid is…. Show Answer


Q1054) The compound that gives chorine like smell is: Show Answer


Q1055) When ammonia is dissolved in water: Show Answer


Q1056) Hyponitrous acid is: Show Answer


Q1057) Which of the following is planar? Show Answer


Q1058) Which oxide of N is neutral? Show Answer


Q1059) Ozone is manufactured by carrying silent electric discharge using: Show Answer


Q1060) Which forms new compound in air? Show Answer


Q1061) Which statement regarding He is incorrect? Show Answer


Q1062) Reactivity of NO is due to: Show Answer


Q1063) Which of the following statement is true? Show Answer


Q1064) Welding of magnesium can be done in an atmosphere of: Show Answer


Q1065) In which reaction there is no change in valency and the oxidation state? Show Answer


Q1066) When a lead storage battery is discharged: Show Answer


Q1067) The oxygen family is characterised by the electronic configuration: Show Answer


Q1068) Which one of the following noble gases is used in miner's cap lamps? Show Answer


Q1069) On heating silver nitrate strongly ……. is obtained finally: Show Answer


Q1070) Pure phosphine is not combustible while impure phosphine is combustible, this combustibility is due to the presence of: Show Answer


Q1071) Bleaching powder on standing forms mixture of: Show Answer


Q1072) Which statement is not correct? Show Answer


Q1073) Which acid can combine with its own salt again? Show Answer


Q1074) The number of electrons in a halogen in its outermost orbit in comparison with corresponding noble gas is: Show Answer


Q1075) The deep blue colour produced on adding excess of ammonia to copper sulphate solution is due to the presence of: Show Answer


Q1076) The solubility of noble gases in water shows the order: Show Answer


Q1077) Which of the following oxo-acids of chlorine is formed on shaking chlorine water with freshly precipitated yellow oxide of mercury? Show Answer


Q1078) Which of the element listed below occurs in allotropic forms? Show Answer


Q1079) Phosphorus is present in bones as: Show Answer


Q1080) Noble gases are adsorbed by: Show Answer


Q1081) Paramagnetic molecule is: Show Answer


Q1082) Which is a poison? Show Answer


Q1083) The element than oxidizes water to oxygen with evolution of heat is: Show Answer


Q1084) Which of the following compounds is not an "interpseudohalogen"? Show Answer


Q1085) Which of the following is a tribasic acid? Show Answer


Q1086) Presence of sulphide ion cannot be confirmed by: Show Answer


Q1087) Peroxy compound is: Show Answer


Q1088) T-shaped interhalogen compound is Show Answer


Q1089) Nitre cake is: Show Answer


Q1090) Helium is used in balloons in place of hydrogen because it is Show Answer


Q1091) The O—O bond length in ozone is: Show Answer


Q1092) The lightest, non-inflammable gas is: Show Answer


Q1093) The reaction in the Kipp's apparatus stops on closing the outlet, because: Show Answer


Q1094) Which of the following chloride is water insoluble? Show Answer


Q1095) Which radical can bring about the highest oxidation state of a transition metal? Show Answer


Q1096) Which of the following halogens can replace others form their salt solutions? Show Answer


Q1097) Metal reacts with Sulphur to give: Show Answer


Q1098) The non-metal other than graphite having metallic lustre is: Show Answer


Q1099) Ozone turns benzidine paper: Show Answer


Q1100) Which statement is incorrect? Show Answer


Q1101) The bond Br—Cl is: Show Answer


Q1102) Which element is extracted commercially by the electrolysis of an aqueous solutions of one of its compounds? Show Answer


Q1103) Which of the following gases exists more abundantly in nature than the others? Show Answer


Q1104) Which inert gas has the highest boiling point? Show Answer


Q1105) Ammonium dichromate is used in some fireworks. The green coloured powder blown is: Show Answer


Q1106) A gas, that relights glowing splinter, is Show Answer


Q1107) The acid which forms two series of salts: Show Answer


Q1108) Which among the following factors is the most important in making fluorine the strongest oxidizing agent? Show Answer


Q1109) The structure of white phosphorus is: Show Answer


Q1110) Halogens are: Show Answer


Q1111) Radon was discovered by: Show Answer


Q1112) The general formula of hypophosphorous acid is: Show Answer


Q1113) Ammonia on catalytic oxidation gives an oxide from which nitric acid is obtained. The oxide is: Show Answer


Q1114) Ammonia is dried over Show Answer


Q1115) The structural formula of hypophosphorus acid is Show Answer


Q1116) Which one of the following oxides of nitrogen dimerises into a colourless solid /liquid on cooling? Show Answer


Q1117) Which ion cannot be precipitated from water? Show Answer


Q1118) Ozone acts as: Show Answer


Q1119) Correct order of reactivity Show Answer


Q1120) When bleaching powder is treated with carbon dioxide: Show Answer


Q1121) Red P can be obtained by white P by Show Answer


Q1122) A solution of chlorine in water contains: Show Answer


Q1123) Helium gives a characteristic spectrum with: Show Answer


Q1124) Molecules of a noble gas do not posses virbrational energy because a noble gas Show Answer


Q1125) When chlorine is passed through concentrated solution of KOH, the compound formed is Show Answer


Q1126) Which of the following oxides of nitrogen is the anhydride of nitrous acid? Show Answer


Q1127) Halogen molecules are: Show Answer


Q1128) Least stable oxide of chlorine is Show Answer


Q1129) Bromine water is decolourised by: Show Answer


Q1130) Fluorine reacts with water to give Show Answer


Q1131) The electronic configurations of four elements are given below. Which element does not belong to the same family as others? Show Answer


Q1132) Among the noble gases, xenon reacts with fluorine to give stable xenon fluorides because Show Answer


Q1133) Which phosphorus reacts with KOH solution to produce phosphine gas? Show Answer


Q1134) In solid state of noble gases, the atoms are held together by: Show Answer


Q1135) In the treatment of leukaemia……… is used. Show Answer


Q1136) Among K, Ca, Fe and Zn , the element which can form more than one binary compound with chlorine is Show Answer


Q1137) Red P is used in making: Show Answer


Q1138) Phosphorus pentoxide is widely used as Show Answer


Q1139) Ozone with KI solution produces Show Answer


Q1140) Which are hydrolysed by water? Show Answer


Q1141) In order to prevent the hot metal filament from getting burnt, when the electric current is switched on, the bulb is filled with: Show Answer


Q1142) Weldon mud is: Show Answer


Q1143) Which of the following has—O—O—linkage? Show Answer


Q1144) Which is correct statement? Show Answer


Q1145) If two litre of air is passed repeatedly over heated copper and heated Mg till no further reduction in volume takes place, the volume finally obtained will be approximately: Show Answer


Q1146) The chemical used for cooling in refrigeration or in manufacture of ice is: Show Answer


Q1147) What products are expected from the disproportionation reaction of hypochlorous acid? Show Answer


Q1148) If an allotropic form changes slowly to a stable form. It is called Show Answer


Q1149) The noble gas which behaves abnormally in liquid state is Show Answer


Q1150) Smelling salt is: Show Answer


Q1151) Xenon best reacts with: Show Answer


Q1152) Sulphate ion has …… geometry. Show Answer


Q1153) Sulphur in + 3 oxidation state is present in Show Answer


Q1154) Which of the following is correct with reference to protonic acids? Show Answer


Q1155) A helium atom on losing an electron becomes Show Answer


Q1156) Concentrated nitric acid on heating decomposes to give: Show Answer


Q1157) Bromine is obtained on a commercial scale from: Show Answer


Q1158) Among the following, the basic oxide is Show Answer


Q1159) The blue coloured gas is: Show Answer


Q1160) The gas used in the manufacture of ice-cream is: Show Answer


Q1161) A white precipitate is obtained on hydrolysis of: Show Answer


Q1162) one gas bleaches the color of the flower by reduction while the other by oxidation.The gases are: Show Answer


Q1163) In a given sample of bleaching powder the percentage of available chlorine is 49. The volume of chlorine obtained if 10 g of the sample is treated with HCl at NTP is: Show Answer


Q1164) Which one has the highest percentage of nitrogen? Show Answer


Q1165) Which has maximum pH in aqueous solution? Show Answer


Q1166) Which of the following is not a drying and dehydrating agent? Show Answer


Q1167) Large deposits of sulphur in nature are found in the form of: Show Answer


Q1168) Which of the following does not exist? Show Answer


Q1169) In the upper layer of the atmosphere ozone is formed by the Show Answer


Q1170) The compound that attacks pyrex glass is: Show Answer


Q1171) Calcium phosphide is used in smoke screens because it Show Answer


Q1172) Gaseous HCl is a poor conductor of electricity, while its aqueous solution is a good conductor. This is because: Show Answer


Q1173) The inert gas obtain from the monozite sand is Show Answer


Q1174) Which of the following occurs in free state? Show Answer


Q1175) Oxygen exhibits positive oxidation state in Show Answer


Q1176) Which one is not an acid salt? Show Answer


Q1177) The poisson's ratio for inert gases is: Show Answer


Q1178) Oxygen is gas but sulphur is solid because: Show Answer


Q1179) The noble gas which is not found in atmosphere? Show Answer


Q1180) In contact process impurities of arsenic are removed by: Show Answer


Q1181) Concentrated sulphuric acid does not act as: Show Answer


Q1182) Which halogen does not react with water? Show Answer


Q1183) Which hydride is most acidic? Show Answer


Q1184) Which of the following cannot be formed? Show Answer


Q1185) The discovery of isotopes began with the experiments with: Show Answer


Q1186) In the oxo-acids of chlorine Cl—O bond contains: Show Answer


Q1187) Make the element which displaces three halogens from their compounds Show Answer


Q1188) Which of the following phosphorus is most stable? Show Answer


Q1189) Arsenic acid is: Show Answer


Q1190) The halogen that is most readily reduced is: Show Answer


Q1191) Ozone reacts with dry iodine to give: Show Answer


Q1192) Fluorine absorbs ….. portion of light and appears yellow. Show Answer


Q1193) Which of the element of nitrogen family produce maximum number of oxy-acids? Show Answer


Q1194) Halogens are placed in the VIIA group or gp. 17 of the periodic table, because: Show Answer


Q1195) Nitrosyl chloride is: Show Answer


Q1196) The substance used in smoke screen is Show Answer


Q1197) Which is cyclic phosphate? Show Answer


Q1198) Which possesses highest percentage of ionic character? Show Answer


Q1199) Elements O, S, Se and Te are usually known as: Show Answer


Q1200) Bleaching powder slowly loses its activity when it stands in air. This is due to: Show Answer


Q1201) Which statement is false? Show Answer


Q1202) Which of the following is more soluble in water? Show Answer


Q1203) The number of hydrogen atom (s) attached to phosphorus atom in hypophorus acid is? Show Answer


Q1204) Which of the following compound is tribasic acid? Show Answer


Q1205) Which one of the following cations does not form a complex with ammonia? Show Answer


Q1206) Nuclear fusion produces Show Answer


Q1207) Which of the following oxide does not form acidic aqueous solution? Show Answer


Q1208) Which possesses least stable covalent P—H bond? Show Answer


Q1209) Which one below is a pseudohalide? Show Answer


Q1210) The Nessler's reagent contains: Show Answer


Q1211)
Interhalogen compounds are: Show Answer


Q1212) Fluorine does not show positive oxidation states because: Show Answer


Q1213) The correct order of the thermal stability of hydrogen halides (H-X) is Show Answer


Q1214) Noble gases can be separated by: Show Answer


Q1215) The solubility of iodine in water is greatly increased by: Show Answer


Q1216) The catalyst used in the preparation of red P from yellow P is: Show Answer


Q1217) Which of the following statements is not valid for oxoacids of phosphorus? Show Answer


Q1218) Which statement is not true for astatine? Show Answer


Q1219) The only element in VIA group or group 16 elements, which is definitely a metal, is: Show Answer


Q1220) The gas used in gas thermometer is: Show Answer


Q1221) Which of the following acids does not attack Cu and Ag? Show Answer


Q1222) Number of isotopes of oxygen is: Show Answer


Q1223) Bromine vapour turns moist starch-iodide paper: Show Answer


Q1224) The brown yellow colour often shown by nitric acid can be removed by: Show Answer


Q1225) There is an ozone layer at a height of about 29 kilometres above the surface of the earth. Which of the following statements is true? Show Answer


Q1226) Deep sea divers used to respirate is a mixture of Show Answer


Q1227) Density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by chemical reaction from a compound of nitrogen because aerial nitrogen contains: Show Answer


Q1228) Antichlor is a compound: Show Answer


Q1229) Which reacts rapidly with oxygen in the air at ordinary temperature? Show Answer


Q1230) The chief source of iodine in which it is present as sodium iodate is Show Answer


Q1231) As the atomic number of the halogens increases, the halogens: Show Answer


Q1232) An interhalogen compound is: Show Answer


Q1233) Phosphine is not collected in air because: Show Answer


Q1234) Bones glow in the dark, because: Show Answer


Q1235) Oxygen exhibits positive oxidation state with: Show Answer


Q1236) The atom larger in size as compared to oxygen is: Show Answer


Q1237) What is the oxidising agent chlorine water? Show Answer


Q1238) Which of the following halogens is solid at room temperature? Show Answer


Q1239) The anhydride of nitrous acid is: Show Answer


Q1240) Which of the following is strongest oxidizing agent? Show Answer


Q1241) Which sulphide is insoluble in yellow ammonium sulphide? Show Answer


Q1242) Which one is most basic in character? Show Answer


Q1243) Which oxide is alkaline? Show Answer


Q1244) Oleum is chemically Show Answer


Q1245) Among halogens maximum oxides are formed by: Show Answer


Q1246) Which statement is false? Show Answer


Q1247) Freons are used as: Show Answer


Q1248) Sulphur molecule exists as: Show Answer


Q1249) Noble gases are adsorbed by Show Answer


Q1250) Phosphorus when exposed to air burns spontaneously because: Show Answer


Q1251) Freons are: Show Answer


Q1252) Normality of pure sulphuric acid is: Show Answer


Q1253) A hydride of nitrogen which is acidic is Show Answer


Q1254) The highest ionization potential in a period is shown by: Show Answer


Q1255) The percentage of nitrogen in urea is about: Show Answer


Q1256) Phosphate mineral of phosphorus is: Show Answer


Q1257) Dithionic acid has the formula: Show Answer


Q1258) Among the following nitrates, lead nitrate, silver nitrate, sodium nitrate and ammonium nitrate; the one that decomposes without leaving any solid residue is Show Answer


Q1259) Ammonia and phosphine resemble each other in: Show Answer


Q1260) Tear gas is: Show Answer


Q1261) When ammonium chloride is heated with NaOH, a gas is evolved, which has Show Answer


Q1262) When phosphine is bubbled through solution of silver nitrate…..is precipitated. Show Answer


Q1263) Hydrolysis of one mole of peroxodisulphuric acid produces: Show Answer


Q1264) Which has the same electronic configuration as of inert gas? Show Answer


Q1265) Glacial phosphoric acid is: Show Answer


Q1266) Which of the following pairs is not correctly matched? Show Answer


Q1267) The number of hydrogen atom (s) attached to phosphorus atom in pyrophosphorus acid is Show Answer


Q1268) Which of the following is not correct? Show Answer


Q1269) Which halide does not hydrolyse? Show Answer


Q1270) Caliche is: Show Answer


Q1271) The number of paired electron in oxygen molecule are Show Answer


Q1272) The hydride of group 16 elements showing maximum tendency for complex formation is Show Answer


Q1273) The noble gas which forms interstitial compounds is Show Answer


Q1274) Iodine may be liberated from sodium iodate by: Show Answer


Q1275) Which oxide is of different type than others? Show Answer


Q1276) Oxide of nitrogen used as a catalyst in the lead chamber process for the manufacture of Sulphuric acid is: Show Answer


Q1277) The spectrum of helium is similar to: Show Answer


Q1278) The compound used as refrigerant is: Show Answer


Q1279) Which would quickly absorb oxygen? Show Answer


Q1280) Phosphine is not obtained by the reaction when: Show Answer


Q1281) Nitrogen forms …. Oxides. Show Answer


Q1282) The compound of Sulphur that can be used as refrigerant is: Show Answer


Q1283) Oxygen can be obtained from bleaching powder by: Show Answer


Q1284) The catalyst used in the manufacture of ammonia is Show Answer


Q1285) Substance used in Holme's signal is: Show Answer


Q1286) Which one of the following combines with Fe (II) ions to form a brown complex? Show Answer


Q1287) All the three atoms of ozone are used up when it reacts with: Show Answer


Q1288) Which can act as an acid in sulphuric acid? Show Answer


Q1289) Which is used in vulcanisation of rubber? Show Answer


Q1290) Superphosphate of lime is obtained from the reaction of: Show Answer


Q1291) The anhydride of orthophosphoric acid is: Show Answer


Q1292) Which is bad conductor of electricity? Show Answer


Q1293) Which compound has an incorrect formula? Show Answer


Q1294) The chloric acid and chlorates are: Show Answer


Q1295) Which of the following is known as Berthelot's salt? Show Answer