Practice Test

Q1) Which of the following statement is not true both for B and Al? Show Answer

Q2) In which of the following elements + 1 oxidation state is more stable than +3 ? Show Answer

Q3) Which of the following is used in high temperature thermometry? Show Answer

Q4) Which of the following element is present most abundant in the earth's crust? Show Answer

Q5) Which of the following is a Lewis acid? Show Answer

Q6) Boron compound behave as Lewis acid because of their Show Answer

Q7) The purification method of bauxite containing iron oxide as impurity is known as Show Answer

Q8) Which of the following imparts green color to the burner flame ? Show Answer

Q9) What is molecular formula of Borazole ? Show Answer

Q10) Thermite is a mixture of iron oxide and Show Answer

Q11) Which of the following is not a protonic acid ? Show Answer

Q12) The pair of amphoteric hydroxide is Show Answer

Q13) Which of the following is not correct with regard to the structure of diborane ? Show Answer

Q14) Which of the following mineral does not contain Al ? Show Answer

Q15) Which is true for an element R present in group 13 of the period table ? Show Answer

Q16) Which is the most amphoteric ? Show Answer

Q17) Which of the following statement is not true about potash alum? Show Answer

Q18) Aluminium is most abundant in earth's crust, yet it is obtained from bauxite because Show Answer

Q19) Corundum is Show Answer

Q20) Purification of aluminium by electroytic refining is known as Show Answer

Q21) Which one of the following is used to remove silicon dioxide in the Serpeck's process of purification of bauxite ? Show Answer

Q22) Corundum is an ore of Show Answer

Q23) In Hall's process, the main reagent is mixed with Show Answer

Q24) When bauxite powder is mixed with coke and reacted with nitrogen at 2075 k, carbon monooxide and X are formed. What is the gas formed. What is the gas formed when X is reacted with water? Show Answer

Q25) The chief ore of Al is Show Answer

Q26) Which one of the following has the lowest m.pt.? Show Answer

Q27) Alum is not used Show Answer

Q28) Which of the following statement is incorrect ? Show Answer

Q29) Aluminium(III) chloride forms a dimer because Show Answer

Q30) Which out of the following is potash alum? Show Answer

Q31) Which of the following is not a Lewis acid ? Show Answer

Q32) The aqueous solution of potash alum is Show Answer

Q33) Aluminium reacts with concentrated HCl and Concentrated NaOH to liberated the gases...................respectively Show Answer

Q34) A layer of coke is spread over bauxite during extraction of aluminium. This acts as a/an Show Answer

Q35) Which one of the following element is non-metal? Show Answer

Q36) In diborane the two H-B-H angles are nearly Show Answer

Q37) Which metal is protected by a layer of its own oxide? Show Answer

Q38) Aluminium becomes passive in Show Answer

Q39) Action of caustic soda with soda on aluminium hydroxide gives a compound having formula Show Answer

Q40) Aluminium reacts with caustic soda to form Show Answer

Q41) 'Thermite ' is a mixture of X parts of ferric oxide and Y parts of aluminium powder. X and Y respectively are Show Answer

Q42) Which of the following is the electron deficient molecule ? Show Answer

Q43) Which one is metaboric acid ? Show Answer

Q44) Which of the following does not give a borax bead test? Show Answer

Q45) In a molecule of diborane Show Answer

Q46) Which of the following ions does not exist in an aqueous solution? Show Answer

Q47) Among the following, which show the correct order of magnitude of inert-pair effect ? Show Answer

Q48) Orthoboric acid contains Show Answer

Q49) Which of the following statement is incorrect? Show Answer

Q50) on hydrolysis, diborane produce Show Answer

Q51) By which of the given reaction boeazine prepared? Show Answer

Q52) Which of the following statement is incorrect ? Show Answer

Q53) Which of the following statement is incorrect Show Answer

Q54) The reducing power of Al, Ga, In and Tl are in the same order Show Answer

Q55) Aluminium chloride ionizes in an aqueous solution because Show Answer

Q56) Which of the following metal does not show an inert - pair effect? Show Answer

Q57) Molecular weight of anhydrous aluminium chloride is Show Answer

Q58) Borax on heating with cobalt oxide forms a blue bead of Show Answer

Q59) All alum contains Show Answer

Q60) Which of the following structure correctly represents the boron trifluoride molecule ? Show Answer

Q61) The borax bead is chemically Show Answer

Q62) By which of the following reaction is borazine prepared ? Show Answer

Q63) Chemically borax is Show Answer

Q64) Which of the following structure does not represent the compound given in parenthese ? Show Answer

Q65) Aluminium deposition as vapour on glass form a good mirror, essentially because Show Answer

Q66) When a solution of sodium hydroxide is added in excess to the solution of potash alum, we obtain Show Answer

Q67) Boric acid is prepared from borax by the action of Show Answer

Q68) Anodised aluminium is Show Answer

Q69) Boric acid is not used as Show Answer

Q70) Alane is chemically Show Answer

Q71) Reactivity of borazole is greater than that of benzene because Show Answer

Q72) Mineral of aluminium that does not contain oxygen is Show Answer

Q73) Which one of following elements has the highest melting point ? Show Answer

Q74) The element which show least metallic character is Show Answer

Q75) Which member of group 13 does not exhibit the group valency in its compounds ? Show Answer

Q76) Group 13 element shows Show Answer

Q77) Which of the following statement is incorrect ? Show Answer

Q78) The melting point of group 13 follows the order Show Answer

Q79) Which of the metal chlorides has maximum covalent character ? Show Answer

Q80) Among the halides of the element of group 13 the one which is most acidic is Show Answer

Q81) Which one of the following oxides is strongly basic ? Show Answer

Q82) The amphoteric oxide from among the following is Show Answer

Q83) The power of halides of boron to act as Lewis acids decrease in the order Show Answer

Q84) Pick up the wrong statement Show Answer

Q85) Which of the following hydroxide is acidic ? Show Answer

Q86) In borax bead test the coloured ions give characteristic colored beads due to formation of Show Answer

Q87) Which of the following is not isomorphous with true alum and is called pseudoalum ? Show Answer

Q88) Which of the following property does not support anomalous behaviour of boron? Show Answer

Q89) Two elements X and Y react separately with highly electropositive metal to form binary compounds, which upon hydrolysis yield mixture of boranes and silanes X and Y separately are Show Answer

Q90) Boric acid is polymeric due to Show Answer

Q91) Which of the following s not Lewis acid ? Show Answer

Q92) Which of the following statement is correct ? Show Answer

Q93) The type of hydridization of boron in diborane is Show Answer

Q94) The hardest compound of boron is Show Answer

Q95) Which of the following is a gas ? Show Answer

Q96) Inorganic benzene is Show Answer

Q97) Which is used as disinfectant? Show Answer

Q98) Which of the following does not have a tetrahedral structure ? Show Answer

Q99) Which of the following statement is false ? Show Answer

Q100) Borax is not used Show Answer

Q101) Aluminothermy used for on the spot welding of large iron structure is based upon the fact that Show Answer

Q102) The chemical formula of bauxite is Show Answer

Q103) Inert pair effect plays an important role in case of Show Answer

Q104) Which of the following is correct statement? Show Answer

Q105) A particular element belong to group 13 and second period of the periodic table, it is Show Answer

Q106) In the Hoope's process for refining of Al the fused materials form three different layers and they remain separated during electrolysis also. This is because Show Answer

Q107) In the electrolytic extraction of aluminium fused cryolite is added Show Answer

Q108) The chemical composition of cryolite mineral Show Answer

Q109) Which of the following process does not involve a catalyst ? Show Answer

Q110) Aluminium vessels should not be washed with materials containing washing soda since Show Answer

Q111) Aluminium is more reactive than iron but aluminium is less easily corroded than iron because Show Answer

Q112) Which is not a mineral of aluminium ? Show Answer

Q113) Aluminum chloride is a / an Show Answer

Q114) Aluminium oxide is not reduced by chemical reactions since Show Answer

Q115) Alum is a water purifier because it Show Answer

Q116) An example of alum is Show Answer

Q117) Aluminium helps in purifying water by Show Answer

Q118) Aluminium is extracted by the electrolysis of Show Answer

Q119) Heating an aqueous solution of aluminium chloride to dryness will give Show Answer

Q120) ON the addition of mineral acid to an aqueous solution of borax, the following compound is formed Show Answer

Q121) Alum is used by dyers of clothes Show Answer

Q122) In the aluminothermite process, Al acts as a/an Show Answer

Q123) Hydrogen will not reduce Show Answer

Q124) In the electrolysis of aluminium, cryolite is added to Show Answer

Q125) Alumina is Show Answer

Q126) Which is electrophile ? Show Answer

Q127) Moissan Boron is Show Answer

Q128) The chief impurity present in red bauxite is Show Answer

Q129) Which is strong Lewis acid ? Show Answer

Q130) Borax is prepared by treating colemanite with Show Answer

Q131) Galena is an ore of Show Answer

Q132) The halide which is not hydrolysed is Show Answer

Q133) Which of the following statements is correct with respect to the property of element with increase in atomic number in the carbon family (group 14)? Show Answer

Q134) Which of the following bonds has the most polar character ? Show Answer

Q135) Which of the following is most dense ? Show Answer

Q136) The oxide which cannot act as reducing agent is Show Answer

Q137) A pseudo solid is Show Answer

Q138) Silicon is an important constituent of Show Answer

Q139) Cassiterite is an ore of Show Answer

Q140) Quartz is crystalline variety of Show Answer

Q141) Mark the oxide which is amphoteric in character Show Answer

Q142) Which one of the following allotropic forms of carbon is isomorphous with crystalline silicon Show Answer

Q143) The element that does not form a monoxide is Show Answer

Q144) Butter of tin is Show Answer

Q145) Which of the following is most stable ? Show Answer

Q146) Thomas slag is Show Answer

Q147) Which of the following has no tin in its composition ? Show Answer

Q148) Which of the following halides is the most stable ? Show Answer

Q149) C and Si have Show Answer

Q150) Silica is soluble in Show Answer

Q151) Carborundum is Show Answer

Q152) The percentage of lead in lead pencil is Show Answer

Q153) Which of the following sulphate is insoluble in water Show Answer

Q154) The metal used for making radiation shield is Show Answer

Q155) The substance used as a smoke screen in warfare is Show Answer

Q156) The sequence of acidic character is Show Answer

Q157) Composition of glass is Show Answer

Q158) Which of the following show bonds in silicones ? Show Answer

Q159) Red lead is Show Answer

Q160) In the manufacture of cement which of the following is used ? Show Answer

Q161) Glass reacts with HF to produce Show Answer

Q162) In laboratory, silicon can be prepared by the reaction of Show Answer

Q163) Which does not exist ? Show Answer

Q164) Which of the following is most electronegative ? Show Answer

Q165) Important ore of lead is Show Answer

Q166) The most stable +2 oxidation state is exhibited by Show Answer

Q167) Water is an important fuel. It is a mixture of Show Answer

Q168) When a mixture of air and steam is passed over red hot coke, the out going gas is Show Answer

Q169) Carbon atoms in diamond are bonded with each other in configuration Show Answer

Q170) Which one of the following characteristic property of carbon ? Show Answer

Q171) Diamond is an example of Show Answer

Q172) Water gas is produced by Show Answer

Q173) Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of Show Answer

Q174) Which of the following has the highest calorific value ? Show Answer

Q175) Which of the following types of forces bind together the carbon atoms in diamond ? Show Answer

Q176) Carbogen is Show Answer

Q177) In graphite, electrons are Show Answer

Q178) Higher percentage of carbon is found in Show Answer

Q179) Diamond and Emerald are formed of Show Answer

Q180) The green house effect is caused by Show Answer

Q181) Which one of the following allotropic forms of carbon isomorphous with crystalline silicon ? Show Answer

Q182) In graphite, the sheets are held by Show Answer

Q183) Graphite is Show Answer

Q184) Pyrosilicate ion is Show Answer

Q185) The variety of glass used in making lenses and prisms is Show Answer

Q186) An alloy of Pb and Sn in equal proportion is called Show Answer

Q187) Graphite is similar to Show Answer

Q188) A fibrous mineral which can withstand red hot flames without any damage is Show Answer

Q189) The stability of the tetrahalides of carbon decrease in the order Show Answer

Q190) Which of the following is most ionic ? Show Answer

Q191) Which of the following metal carbides may be called a methanide? Show Answer

Q192) Carbon -60 contains Show Answer

Q193) Which of the following statement is correct ? Show Answer

Q194) In carbon monoxide molecule, carbon and oxygen are linked by Show Answer

Q195) Which of the following statement is incorrect ? Show Answer

Q196) In carbon -60 all carbon atoms are Show Answer

Q197) Which of the following compounds is used as an abrasive ? Show Answer

Q198) Which of the following is industrial fuel ? Show Answer

Q199) Which of the following oxides of carbon is unstable ? Show Answer

Q200) Chemically zeolites are Show Answer

Q201) lead sugar is Show Answer

Q202) Carbon dioxide is gas but silica is a solid because Show Answer

Q203) Which of the following show bond in silicone Show Answer

Q204) Which element does not exhibit allotropy ? Show Answer

Q205) Semi water gas is a mixture of Show Answer

Q206) Wood charcoal is used in gas masks because it Show Answer

Q207) Aqueous solution of sodium silicate is Show Answer

Q208) Which gas is essential constituent of almost all fuel gases ? Show Answer

Q209) Which gas present in atmosphere darkens the surface painted by white lead ? Show Answer

Q210) Bell metal is an alloy of Show Answer

Q211) Tin plague is the Show Answer

Q212) Which is the least pure form of carbon ? Show Answer

Q213) The component present in greater proportion in water gas is Show Answer

Q214) tin cry refers to Show Answer

Q215) Plumbo-solvency means dissolution of lead in Show Answer

Q216) A reducing agent is Show Answer

Q217) Which oxide has three dimensional structure Show Answer

Q218) Purest form of silica is Show Answer

Q219) Which gas has more percentage in coal gas? Show Answer

Q220) Least stable hydride is Show Answer

Q221) Which is not a allotrope of carbon ? Show Answer

Q222) Which has peroxide linkage ? Show Answer

Q223) Which is not the property of diamond ? Show Answer

Q224) Minium is Show Answer

Q225) Which is not correct? Show Answer

Q226) Litharage is not commonly Show Answer

Q227) Which one of these is acidic ? Show Answer

Q228) Carbon forms a large no. of compound because it has Show Answer

Q229) Ge(II) compounds are powerful reducing agent whereas Pb(IV) compounds are strong oxidants .This can be due to Show Answer

Q230) The composition of the common glass is Show Answer

Q231) The shape of carbon dioxide molecule is Show Answer

Q232) Which of the following combines with haemoglobin of the blood to form caboxyhaemoglobin? Show Answer

Q233) Which of the following is amphoteric ? Show Answer

Q234) Which of the following has maximum bond dissociation energy ? Show Answer

Q235) A gas which burns with blue flame is Show Answer

Q236) Which of the following gases causes pollution when present in the exhaust fumes of vehicles ? Show Answer

Q237) Natural gas is Show Answer

Q238) Lead sulphate is soluble in Show Answer

Q239) Which of the following lead oxides is 'Sindhur'? Show Answer

Q240) Atomic orbitals of carbon involved in diamond structure are Show Answer

Q241) Wood charcoal is used to decolourise sugar because it Show Answer

Q242) In graphite, C atom is in ..................state Show Answer

Q243) An oxide of lead which is used in lead storage batteries , in safety matches and is powerful oxidizing agent is Show Answer

Q244) Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite Show Answer

Q245) Glass is a Show Answer

Q246) The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards of the tin buttons of their uniforms. White metallic tin button got converted to grey powder. This transformation is related to Show Answer

Q247) In silicon dioxide Show Answer

Q248) The stability of dihalides of Si, Ge, Sn and Pb increase steadily in the sequence Show Answer

Q249) Carborundum is obtained when silica is heated at high temperature with Show Answer

Q250) Moderate electrical conductivity is shown by Show Answer

Q251) The electronegativity of the following elements increase in the order Show Answer

Q252) The species that does not contain peroxide ions is Show Answer

Q253) Material used in solar cell contain Show Answer

Q254) Which of the following halides is least stable and has double existence ? Show Answer

Q255) Which of the following oxides is neutral ? Show Answer

Q256) In laboratory burners, we use Show Answer

Q257) Which of the following oxide is amphoteric in character ? Show Answer

Q258) A metal M forms chlorides in +2 and +4 oxidation states Which of the following about these chlorides is correct ? Show Answer

Q259) Statement 1 : White phosphorus is stored under water.
Statement 2 : White phosphorus is highly reactive and catches fire spontaneously in air. Show Answer

Q260) Statement 1 : Boranes are volatile and decompose to boron, and hydrogen at red heat.
Statement 2 : All the boranes react with ammonia depending on the conditions. Show Answer

Q261) Statement 1 : Among chalcogens, tendency of catenation is maximum for sulphur.
Statement 2 : S-S bond dissociation energy is higher then O-O bond dissociation energy. Show Answer

Q262) Statement 1 : Si-Si bonds are weaker than Si-O bonds.
Statement 2 : Silicon forms double bonds with itself. Show Answer

Q263) 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

Q264) Boron nitride on reacting with caustic alkali gives: Show Answer

Q265) The different layers in graphite are held together by Show Answer

Q266) Colemanite is a mineral of: Show Answer

Q267) Which of the following is a mixed oxide? Show Answer

Q268) In the sale of diamonds the unit of weight is carat. One carat is equal to: Show Answer

Q269) Which gas present in atmosphere darkens the surface painted by white lead? Show Answer

Q270) Which of the following is most abundant in the earth crust? Show Answer

Q271) Which form of carbon has a two-dimensional sheet-like structure? Show Answer

Q272) Extraction of metal from the ore cassiterite involves Show Answer

Q273) An alumina-silica clay, called bentonite is dropped from aeroplanes in the slurry form for: Show Answer

Q274) Gun shots are made of lead with a little arsenic. The function of As is to increase: Show Answer

Q275) The glass having smallest coefficient of thermal expansion is : Show Answer

Q276) Tin plague is the: Show Answer

Q277) Water glass is: Show Answer

Q278) If a person is injured by the shot of a gun and all the pellets could not be removed, it may cause poisoning by: Show Answer

Q279) Which property is common in diamond and graphite? Show Answer

Q280) In which of the following the inert pair effect is most prominent? Show Answer

Q281) Which oxide has three dimensional structure? Show Answer

Q282) Diamond and graphite are: Show Answer

Q283) Minium is: Show Answer

Q284) Which of the following is called alum? Show Answer

Q285) The carbon of microphones used in public address systems is : Show Answer

Q286) In Gold Schmidt reaction, certain metallic oxides are reduced to the metallic state by-heating with: Show Answer

Q287) Formula for agate is Show Answer

Q288) Pure CO can be obtained from: Show Answer

Q289) Which is used for the manufacture of optical instruments? Show Answer

Q290) Which element has a limited coordination number of four? Show Answer

Q291) In Goldschmidt aluminothermic process, thermite contains
Show Answer

Q292) During the electrolysis of cryolite, aluminium and fluorine are formed in molar ratio Show Answer

Q293) Suppose you have to determine the percentage of carbon dioxide in a sample of a gas available in a container. Which is the best absorbing material for the carbon dioxide? Show Answer

Q294) Which gas is used in airated water? Show Answer

Q295) Which is not an ore of lead? Show Answer

Q296) Borax on heating with cobalt oxide forms a blue bead of: Show Answer

Q297) Inorganic benzene is: Show Answer

Q298) The correct formula of borax is: Show Answer

Q299) The formula of mineral borax is Show Answer

Q300) The hardest compound of boron is: Show Answer

Q301) For purification of alumina, the modern processes most useful when (i) the impurity present is a lot iron oxides and (ii) the impurity present is a lot of silica, are Show Answer

Q302) Tin, a silvery white metal exists in: Show Answer

Q303) Which of the following oxide is amphoteric? Show Answer

Q304) Which of the following does not have a tetrahedral structure? Show Answer

Q305) Which of the following oxides is strongly basic? Show Answer

Q306) Aluminium metal is corroded in coastal places near to the sea, because protective oxide film: Show Answer

Q307) The most abundant metal in the earth crust Show Answer

Q308) Which mixed sulphate is not an alum? Show Answer

Q309) In the aluminothermic process, Al acts as a/an Show Answer

Q310) Which is used as control rods in nuclear reactors? Show Answer

Q311) Potash alum is water soluble and ionises in aqueous solution to give: Show Answer

Q312) Lead sugar is: Show Answer

Q313) Which does not exist? Show Answer

Q314) Which form of carbon is used in making boot polish, printing ink, paint and black varnish? Show Answer

Q315) Which of the following shows bond in silicone? Show Answer

Q316) Which of the following organo-silicon compound on hydrolysis will give a three dimensional silicone? Show Answer

Q317) Tin sulphide is: Show Answer

Q318) Lead pipes are not suitable for drinking water because Show Answer

Q319) Aluminium forms: Show Answer

Q320) Which oxidation states are the most characteristics of lead and tin respectively? Show Answer

Q321) The alloy used in preparation of balance beam: Show Answer

Q322) The substance used to impart green colour to glass is: Show Answer

Q323) Which metal powder if spread in air, becomes hazardous? Show Answer

Q324) Crystalline silicon was obtained by: Show Answer

Q325) Aluminium is more reactive than iron but aluminium is less easily corroded than iron because: Show Answer

Q326) Silicon hydrides are named as: Show Answer

Q327) Which compound can make fire proof clothes? Show Answer

Q328) A kettle which becomes furred-up in use has inside it a deposit composed mainly of: Show Answer

Q329) Aluminium is obtained by Show Answer

Q330) Which of the following is not correct in case of boron nitride? Show Answer

Q331) Zn on heating with barium carbonate gives : Show Answer

Q332) Hybridisation of boron in diborane is: Show Answer

Q333) When tin is treated with concentrated nitric acid Show Answer

Q334) The ability of a substance to assume two or more crystalline structures is called: Show Answer

Q335) Glass is soluble in: Show Answer

Q336) Duralumin is an alloy of: Show Answer

Q337) Among the following the purest form of carbon is : Show Answer

Q338) Which of the following anion is present in chain structure of silicate? Show Answer

Q339) Tin reacts with: Show Answer

Q340) Which gas is responsible for green house effect? Show Answer

Q341) Al and Ga have the same covalent radii because of: Show Answer

Q342) Magnalium contains Show Answer

Q343) Crystalline form of silica is called Show Answer

Q344) Borax is prepared by treating colemanite with: Show Answer

Q345) Which is not the property of diamond? Show Answer

Q346) What happens when steam is passed over red hot carbon? Show Answer

Q347) In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to Show Answer

Q348) Purest form of silica is : Show Answer

Q349) Alzeimer's disease is caused due to Al interaction with internal organs of the body if food is contaminated with Al. This disease Show Answer

Q350) Metalloid among the following is: Show Answer

Q351) Alumina may be converted into anhydrous aluminium chloride by: Show Answer

Q352) The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence

Show Answer

Q353) PbO is Show Answer

Q354) Among the following the maximum covalent character is shown by the compound: Show Answer

Q355) Asbestos is chemically: Show Answer

Q356) The structure of diborane contains: Show Answer

Q357) Borax is: Show Answer

Q358) Heating an aqueous solution of aluminium chloride to dryness will give Show Answer

Q359) Hoope's process is used for the purification of the metal Show Answer

Q360) Which of the following is the electron deficient molecule? Show Answer

Q361) A gas does not turn lime water milky, supports the combustion of burning magnesium. It has no smell and is colourless. It extinguishes a glowing splint but under some circumstances reacts with oxygen and hydrogen. It is not poisonous. The gas is likely to be : Show Answer

Q362) Which compound is solid? Show Answer

Q363) The first I.P. of Al is smaller than that of Mg because: Show Answer

Q364) Which type of forces bind together the carbon atoms in diamond? Show Answer

Q365) Ordinary glass is: Show Answer

Q366) The common semiconductor is: Show Answer

Q367) Plumbo-solvency means dissolution of lead in: Show Answer

Q368) Which of the following does not exist in free form? Show Answer

Q369) On doping Ge metal with a little of ln, one gets: Show Answer

Q370) Vapour density of which gas is near to air? Show Answer

Q371) Muddy water can be purified through coagulation by using Show Answer

Q372) Carbon monoxide on heating with sulphur gives: Show Answer

Q373) In electrolysis of aluminium oxide which of the following is added to accelerate the process Show Answer

Q374) The most abundant gas in ordinary air among the following is: Show Answer

Q375) Silicon is usually found in: Show Answer

Q376) Corundum is: Show Answer

Q377) Synthetic gas is a mixture of: Show Answer

Q378) Lead pipes can be used for: Show Answer

Q379) The core of a non-luminous Bunsen burner flame is observed to be yellow in colour. This is because of: Show Answer

Q380) Aluminium is not present in which of the following mineral? Show Answer

Q381) The correct order of decreasing ionic nature of lead dihalides is : Show Answer

Q382) Diborane does not undergo cleavage reaction with: Show Answer

Q383) The correct Lewis acid order for boron halides is: Show Answer

Q384) Formula of felspar is Show Answer

Q385) Stannous oxide can be obtained by: Show Answer

Q386) Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of : Show Answer

Q387) The fraction by volume of carbon monoxide in producer gas is about: Show Answer

Q388) Alum is not used: Show Answer

Q389) The mass of carbon anode consumed (giving only carbon dioxide) in production of 270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass of Al = 27) Show Answer

Q390) Carbon dioxide dissolves under pressure in water to give: Show Answer

Q391) Which fuel has the highest calorific value? Show Answer

Q392) Which of the following is not correct? Show Answer

Q393) The chemical formula of sindhur is Show Answer

Q394) When sand is heated with hydrofluoric acid and a wet rod is brought in contact with vapours evolving a white deposit is due to Show Answer

Q395) Which is not a characteristic property of carbon? Show Answer

Q396) Which of the following is more stable? Show Answer

Q397) The relative Lewis acid character of boron trihalides is in the order Show Answer

Q398) In diborane the two H-B-H angles are nearly Show Answer

Q399) Thermite is a mixture of Show Answer

Q400) Alum is added to muddy water because Show Answer

Q401) White lead or basic lead carbonate is: Show Answer

Q402) Among the various allotropes of carbon : Show Answer

Q403) Oxides of silicon are: Show Answer

Q404) The reducing agent in thermite process is Show Answer

Q405) Man dies in an atmosphere of carbon monoxide, because it: Show Answer

Q406) Which has highest b.p.? Show Answer

Q407) There are two H-bridge bonds in diborane molecule because there are: Show Answer

Q408) Which of the following oxides is amphoteric in character? Show Answer

Q409) Water gas is produced by: Show Answer

Q410) CO forms a volatile compound with: Show Answer

Q411) Which one of the following statements about the zeolite is false? Show Answer

Q412) The order of acidic strength of boron trihalides Show Answer

Q413) Alane is chemically: Show Answer

Q414) Heating an aqueous solution of aluminium chloride to dryness will give: Show Answer

Q415) Buckminster fullerene is Show Answer

Q416) Lead (IV) oxide is obtained by : Show Answer

Q417) Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that, graphite Show Answer

Q418) Aluminium becomes passive in nitric acid because it: Show Answer

Q419) Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is Show Answer

Q420) An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to Show Answer

Q421) Which of the following form dimeric halides? Show Answer

Q422) Aluminium appears like gold when it is mixed with: Show Answer

Q423) The C—X bond energy order for carbon tetra halides is: Show Answer

Q424) An example of a major air pollutant is: Show Answer

Q425) Which of the following is used in making printer's ink, shoe polish, black varnish and paint? Show Answer

Q426) Pewter is an alloy of : Show Answer

Q427) Nickeloy is an alloy containing: Show Answer

Q428) Rose metal is an alloy of: Show Answer

Q429) The hottest part of the Bunsen burner flame is: Show Answer

Q430) An insulator is: Show Answer

Q431) By chlorinating carbon disulphide with chlorine in presence of aluminium chloride, we get: Show Answer

Q432) The element which forms neutral as well as acidic oxides is: Show Answer

Q433) In the alumino-thermic process, aluminium acts as: Show Answer

Q434) Carborundum is the commercial name of : Show Answer

Q435) Which is amphoteric compound? Show Answer

Q436) Diborane reacts with water to form: Show Answer

Q437) Pyrex glass is a mixture of : Show Answer

Q438) Amorphous boron on burning in air forms: Show Answer

Q439) Be and Al exhibits many properties which are similar but the two elements differ is: Show Answer

Q440) What is the state of hybridization of carbon in fullerene? Show Answer

Q441) Boron was isolated by: Show Answer

Q442) Borax bead test is responded by: Show Answer

Q443) Which of the following gives propyne on hydrolysis? Show Answer

Q444) Which has highest bond energy? Show Answer

Q445) Lead may be replaced from its salt solution by: Show Answer

Q446) On the addition of mineral acid to an aqueous solution of borax, the compound formed is: Show Answer

Q447) An aqueous solution of potash alum gives Show Answer

Q448) Unstable lead compounds are Show Answer

Q449) Which is neutral to litmus? Show Answer

Q450) Bell metal is an alloy of : Show Answer

Q451) Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out: Show Answer

Q452) Coke is obtained from coal by: Show Answer

Q453) The liquid field metal expanding on solidification is Show Answer

Q454) Graphite is used in nuclear reactors: Show Answer

Q455) Carbon tetrachloride has zero dipole moment because of: Show Answer

Q456) Massicot is prepared by: Show Answer

Q457) Animal charcoal is used for decolourisation of sugar because: Show Answer

Q458) Pyrosilicate ion is: Show Answer

Q459) What is the number of free electrons present on each carbon atom in graphite? Show Answer

Q460) Diaspora is: Show Answer

Q461) Which of the following reactions occurs at the cathode during the charging of lead accumulator? Show Answer

Q462) The coal form containing maximum percentage of carbon is: Show Answer

Q463) Water softner is Show Answer

Q464) The main constituents of coal gas are: Show Answer

Q465) Carbon dioxide is a gas but silica is a solid because : Show Answer

Q466) Alums are used for Show Answer

Q467) Lead pipes are corroded quickly by Show Answer

Q468) Melting point is highest for: Show Answer

Q469) Purification of alumina is essential because: Show Answer

Q470) Which one shows most pronounced inert pair effect? Show Answer

Q471) Producer gas, a fuel and also a source of nitrogen is obtained by: Show Answer

Q472) Which of the following is an ore of lead? Show Answer

Q473) White lead is Show Answer

Q474) Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. While metallic tin buttons got converted to grey powder. This transformation is related to Show Answer

Q475) Anodised aluminium is: Show Answer

Q476) The variety of glass, used for the preservation of eggs is: Show Answer

Q477) Solder is an alloy of lead with Show Answer

Q478) Which of the following is used for making optical instruments? Show Answer

Q479) Tincal is Show Answer

Q480) Tin (II) fluoride (anhydrous) can be obtained by : Show Answer

Q481) Producer gas is a mixture of: Show Answer

Q482) Which statement is false? Show Answer

Q483) Which of the following is the correct statement for red lead? Show Answer

Q484) The formula of potash alum is Show Answer

Q485) Potash alum dissolves in water to give a/an Show Answer

Q486) Which is the least pure form of carbon? Show Answer

Q487) The calorific value of carbon is about ……. kcal. Show Answer

Q488) Aluminium metal is refined by Show Answer

Q489) Which one of the following metals work as a reduction in smelting process? Show Answer

Q490) Which of the following has structure similar to graphite? Show Answer

Q491) Tin (II) chloride (anhydrous) can be obtained: Show Answer

Q492) An element A dissolves both in acid and alkali. It is an example of Show Answer

Q493) Which statement is not true about potash alum? Show Answer

Q494) Which melts in boiling water? Show Answer

Q495) Solder is an alloy of : Show Answer

Q496) Hardest element of III A group of gp.13 is: Show Answer

Q497) Tin cry refers to: Show Answer

Q498) The composition of the common glass is Show Answer

Q499) The method of zone refining of metals is based on the principle of Show Answer

Q500) Feldspar is: Show Answer

Q501) The thermal stability order for group 14 halides is: Show Answer

Q502) Tungsten carbides is an example of: Show Answer

Q503) The hybridization of boron atom in orthoboric acid is: Show Answer

Q504) Which of the following is known as inorganic benzene? Show Answer

Q505) Which is not an allotrope of carbon? Show Answer

Q506) Carbogen is: Show Answer

Q507) Mica is chemically: Show Answer

Q508) The compound used in lead accumulators is: Show Answer

Q509) Which of the following is pseudoalum? Show Answer

Q510) Which element does not exhibit allotropy? Show Answer

Q511) One that marks the paper like lead is: Show Answer

Q512) Carbon monoxide will not reduce: Show Answer

Q513) Graphite is made by heating coke with silica for many hours in a : Show Answer

Q514) Which of the following undergoes sublimation? Show Answer

Q515) Which is used as mordant? Show Answer

Q516) Molecular weight of anhydrous aluminium chloride is: Show Answer

Q517) The elements of IV A group or group 14 have 4 electrons in their outermost orbit. They: Show Answer

Q518) In purification of bauxite by hall's process Show Answer

Q519) Newton's alloy contains : Show Answer

Q520) Boron readily dissolves in: Show Answer

Q521) Which of the following is not a Lewis acid? Show Answer

Q522) The protective film of oxide on the surface of Al metal may be strengthened by: Show Answer

Q523) Sapphire is a mineral of: Show Answer

Q524) Which is/are fire extinguishers? Show Answer

Q525) The borax bead is chemically: Show Answer

Q526) Which of the following is only acidic in nature? Show Answer

Q527) Which poisonous gas is present in the exhaust of car? Show Answer

Q528) A metallic oxide which imparts purple colour to pottery is: Show Answer

Q529) Inorganic benzene is Show Answer

Q530) The cryolite is: Show Answer

Q531) Quartz is made of silicon and oxygen joined in a network arrangement that is similar to : Show Answer

Q532) Eka aluminium is: Show Answer

Q533) Boric acid is prepared from borax by the action of: Show Answer

Q534) The acid used for etching the glass is: Show Answer

Q535) The greatest percentage of CO is in: Show Answer

Q536) The process used for purification of bauxite are containing iron oxide impurity is known as: Show Answer

Q537) Which of the following does not contain silicon? Show Answer

Q538) Which statement is correct? Show Answer

Q539) Which one of the following statements about the zeolites is false? Show Answer

Q540) Least stable hydride is : Show Answer

Q541) Which is true for an element R present in III group of the periodic table? Show Answer

Q542) Which is correct oxidation state of lead? Show Answer

Q543) In III A group, Tl (thalium,) shows +1 oxidation state while other members show +3 oxidation state, why? Show Answer

Q544) Which of the following is a three dimensional silicate? Show Answer

Q545) Hydrogen forms a bridge in the chemical structure of: Show Answer

Q546) Boron differs from the other members of group 13 because it: Show Answer

Q547) Which of the following is a use of alum? Show Answer

Q548) Which fuel has the highest calorific value (kJ/kg)? Show Answer

Q549) Which of the following is a gas? Show Answer

Q550) Lead sulphate is soluble in : Show Answer

Q551) Colour is imparted to glass by mixing: Show Answer

Q552) Dry ice is Show Answer

Q553) Mineral of aluminium that does not contain oxygen is: Show Answer

Q554) Which one of the following ores is best concentrated by froth-floatation method? Show Answer

Q555) Which metal is powdered, suspended in oil and used as paint? Show Answer

Q556) Aqueous solution of potash alum is: Show Answer

Q557) In alumino thermic process, Al is used as Show Answer

Q558) The composition of mica is: Show Answer

Q559) Coal gas: Show Answer

Q560) Lead chromate is……..in colour. Show Answer

Q561) Which halide is least stable and has doubtful existence? Show Answer

Q562) Litharge is not commonly used in : Show Answer

Q563) The precious Ruby stone is: Show Answer

Q564) Wood charcoal is used in gas masks because it: Show Answer

Q565) On strong heating lead nitrate gives: Show Answer

Q566) Which is not correct? Show Answer

Q567) All alums contain: Show Answer

Q568) The molecules of aluminium chloride in vapour state: Show Answer

Q569) Semi water gas is mixture of : Show Answer

Q570) Borax bead test is not given by: Show Answer

Q571) The correct order of increasing atomic radii, is Show Answer

Q572) Boric acid is not used: Show Answer

Q573) Identify the statement that is not correct as far as structure of diborane is concerned Show Answer

Q574) Which of the following is amphoteric? Show Answer

Q575) Which of the following is not an ionic trihalide? Show Answer

Q576) Which of the following processes does not involve a catalyst? Show Answer

Q577) The metal which does not form a polynuclear carbonyl is : Show Answer

Q578) Tetra ethyl lead is used as: Show Answer

Q579) Which of the following statement is correct with respect to the property of elements in the carbon family with an increase in the atomic number? Their Show Answer

Q580) The chemical formula of phosgene or carbonyl chloride is: Show Answer

Q581) Which is not a mineral of aluminium? Show Answer

Q582) Graphite is soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite. Show Answer

Q583) The stability of hydrides of carbon family is in the order Show Answer

Q584) Which does not react with water? Show Answer

Q585) The number of electrons present in the valency shell of group 13: Show Answer

Q586) The metallic character of the elements of IV A group or group 14 : Show Answer

Q587) Which of the boron compound is optically active? Show Answer

Q588) When a solution of sodium hydroxide is added in excess to the solution of potash alum, we obtain: Show Answer

Q589) Foramtion of in-numberable compounds of carbon is due to its Show Answer

Q590) Flux is used to Show Answer

Q591) Electrolytic reduction of pure alumina is not possible because: Show Answer

Q592) Boric acid is used in carom boards for smooth gliding of pawns because Show Answer

Q593) Iodine is decolourised by: Show Answer

Q594) Quartz is an example of Show Answer

Q595) Which can be directly brought into solid state from gaseous state? Show Answer

Q596) In aluminates coordination number of Al is: Show Answer

Q597) Thallium shows different oxidation sates because: Show Answer

Q598) Al reduces most of the metallic oxides due to its greater affinity for: Show Answer

Q599) Water as is Show Answer

Q600) Which one is explosive? Show Answer

Q601) The inert form of carbon is: Show Answer

Q602) Annealing of glass is done to: Show Answer

Q603) Calorific value of producer gas is low because of Show Answer

Q604) Mark the correct statement: Show Answer

Q605) Producer gas is the mixture of Show Answer

Q606) In laboratory silicon can be prepared by the reaction Show Answer

Q607) Which of the following shows variable valency? Show Answer

Q608) Elements of group 13 form oxides of the general formula: Show Answer

Q609) Which statement is correct with respect to the property of the elements with increase in atomic number in the carbon family? Show Answer

Q610) Alumina on heating with carbon in nitrogen atmosphere gives: Show Answer

Q611) Which of the following has the minimum heat of dissociation? Show Answer

Q612) Carbon reacts with strong electropositive metal oxides to form: Show Answer

Q613) Carbon is soluble in: Show Answer

Q614) Tetrahalides of IV A group of group 14 elements are: Show Answer

Q615) The percentage of carbon is least in : Show Answer

Q616) The most reactive form of carbon is: Show Answer

Q617) Which is not used as pigment in paints? Show Answer

Q618) Water glass is Show Answer

Q619) Aluminium does not react with: Show Answer

Q620) Tendency of catenation is strongest in: Show Answer

Q621) Which is not an alloy of aluminium? Show Answer

Q622) Purification of alumina takes place by Show Answer

Q623) Thallium shows different oxidation states because: Show Answer

Q624) Thermite a mixture used for welding is: Show Answer

Q625) Borax bead test depends on the formation of: Show Answer

Q626) The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniform. White metallic tin buttons got converted to grey powder. This transformation is related to Show Answer

Q627) The basic structural unit is silicates is Show Answer

Q628) Good conductor of heat and current is: Show Answer

Q629) Addition of excess of sodium hydroxide solution to stannous chloride solution, we obtain: Show Answer

Q630) Ammonical CuCl absorbs: Show Answer

Q631) The refractive index of diamond is highest among solids. Its value is: Show Answer

Q632) The correct statement with respect to carbon monoxide is: Show Answer

Q633) Which element of group 14 forms only one hydride? Show Answer

Q634) Highest electronegativity among the following is for: Show Answer

Q635) The stability of + 1 oxidation state increases in the sequence: Show Answer

Q636) Ultra violet rays are not allowed to pass through: Show Answer

Q637) Metal protected by a layer of its own oxide is: Show Answer

Q638) The colour of copper metaborate and chromium metaborates are respectively: Show Answer

Q639) Which gas is essential constituent of almost all fuel gases? Show Answer

Q640) The precious stone aquamarine is: Show Answer

Q641) Which metal is an important component of transistors? Show Answer

Q642) When Al is added to potassium hydroxide solution: Show Answer

Q643) An acid among the following is: Show Answer

Q644) CO reacts with chlorine in presence of sunlight to gives: Show Answer

Q645) Which is used in high temperature thermometry? Show Answer

Q646) Silicon is Show Answer

Q647) Which ore is best concentrated by froth floatation process? Show Answer

Q648) Buckminster-fullerene is a variety of Show Answer

Q649) CO is poisonous gas, antidote for CO poisoning is Show Answer

Q650) Commercially important ore of lead is: Show Answer

Q651) Difference between diamond and graphite is due to: Show Answer

Q652) Which element is used for making a transistor? Show Answer

Q653) Which one of the following compounds, is not a protonic acid? Show Answer

Q654) Aluminium reacts with nitrogen to form: Show Answer

Q655) Al-Bronze contains Al and: Show Answer

Q656) Silica is a/an Show Answer

Q657) Which one of the following is used as an acid flux in metallurgy? Show Answer

Q658) Which one of the following is the correct statement? Show Answer

Q659) Which metal burn in air at high temperature with the evolution of much heat? Show Answer

Q660) Boron when heated with carbon forms Show Answer

Q661) Which is a true acid anhydride? Show Answer

Q662) Roasted tin stone ore after washing with water is known as Show Answer

Q663) Activation of charcoal: Show Answer

Q664) Compound of lead used in match industry is: Show Answer

Q665) A particular elements belongs to group 13 and II period of the periodic table. It is: Show Answer

Q666) In graphite, the sheets are held by : Show Answer

Q667) Stable compounds in +1 oxidation state are formed by: Show Answer

Q668) Which of the following is a good conductor of heat and electricity? Show Answer

Q669) Which element occurs in free state? Show Answer

Q670) C and Si belong to IV group or group 14. The maximum coordination number of carbon in commonly occurring compounds is 4, whereas that of silicon is 6. This is due to : Show Answer

Q671) Pyrene (a fire extinguisher) is: Show Answer

Q672) Which does not exist? Show Answer

Q673) The reducing power of divalent species decreases in the order : Show Answer

Q674) The hardest substance amongst the following Show Answer

Q675) The hybridization of carbon in carbon monoxide is: Show Answer

Q676) Newly shaped glass articles when cooled suddenly become brittle, therefore these are cooled slowly, this process is known as: Show Answer

Q677) Aluminium carbide reacts with dil. HCl to give: Show Answer

Q678) The blue coloured mineral 'Lapis Lazuli' used as semiprecious stone is: Show Answer

Q679) The correct order of decreasing hardness of the following compounds is: Show Answer

Q680) It is impossible to fuse strips of copper, silver or iron into soda glass because of a difference in the properties of glass and the metal. The property concerned is: Show Answer

Q681) The catalyst used in Friedel-Craft's reaction is: Show Answer

Q682) The metal used in acid storage batteries is: Show Answer

Q683) In Hall's process, the ore is mixed with: Show Answer

Q684) Sesquioxide of lead is: Show Answer

Q685) Tin (IV) chloride (anhydrous) can be obtained: Show Answer

Q686) What product is formed on heating lead nitrate? Show Answer

Q687) Which of the following imparts green colour to flame: Show Answer

Q688) Destructive distillation of coal does not gives: Show Answer

Q689) Red lead is an example of Show Answer

Q690) Cassiterite is an ore of Show Answer

Q691) Hoope's process is used in the refining of: Show Answer

Q692) Boron compounds behave as Lewis acid because of their: Show Answer

Q693) Which is pseudo solid? Show Answer

Q694) The number of carbon compounds is very large because it: Show Answer

Q695) Which species does not exist? Show Answer

Q696) Boron halides behave as Lewis acids because of their ……… nature. Show Answer

Q697) Silicones have the general formula Show Answer

Q698) Water gas cannot be prepared by a continuous process because: Show Answer

Q699) Glass reacts with HF to produce Show Answer

Q700) Which glass has the highest percentage of lead? Show Answer

Q701) Diamond and graphite both are made of carbon atoms. Diamond is extremely hard whereas graphite is soft. This is because : Show Answer

Q702) ……is the byproduct obtained in the Serpeck's process. Show Answer

Q703) An ionic compound is: Show Answer

Q704) Which one of the following is correct statement? Show Answer

Q705) Density is highest for : Show Answer

Q706) If the flame of a gas stove burns with yellow tips, the burner must be adjusted to provide: Show Answer

Q707) Purification of Al by electrolysis method is called Show Answer

Q708) Which element shows more pronounced inert pair effect? Show Answer

Q709) Teflon is: Show Answer

Q710) The tendency for catenation in Group 14 elements varies in the order Show Answer

Q711) Coordination number of aluminium is Show Answer

Q712) The approximate composition of soda glass is: Show Answer

Q713) Lead pipes are readily corroded by : Show Answer

Q714) Monosilane on coming in contact with air burns with a luminous flame producing vortex rings. These rings are of Show Answer

Q715) Lapis lazuli is Show Answer

Q716) Bone black is an allotrope of : Show Answer

Q717) The use of diamond as a gem depends on its: Show Answer

Q718) PbO is ……..oxide. Show Answer

Q719) Aqueous solution of sodium silicate is: Show Answer

Q720) Boron cannot form which one of the following anions? Show Answer

Q721) During day time plants absorb: Show Answer

Q722) Bucky ball or buck minster fullerene is: Show Answer

Q723) Diamond is hard because Show Answer

Q724) The process used for purification of bauxite ore containing high silica content as impurity is: Show Answer

Q725) Aluminium is mainly extracted from: Show Answer

Q726) A metal, M forms chlorides in its +2 and +4 oxidation states. Which of the following statements about these chlorides is correct? Show Answer

Q727) Which is not a crystalline form of silica? Show Answer

Q728) Which is likely to show inert-pair effect? Show Answer

Q729) A potter wishes to make a deep blue glaze. Which one of these available chemicals should be mixed? Show Answer

Q730) The bonds present in borazole are: Show Answer

Q731) The correct order of the first ionisation enthalpy is Show Answer

Q732) Given below are two statements.
Statement I Boron is extremely hard indicating its high lattice energy.
Statement II Boron has highest melting and boiling point compared to its other group members. In the light of the above statements, choose the most appropriate answer from the options given below. Show Answer

Q733) Which one of the following elements will remain as liquid inside pure boiling water? Show Answer

Q734) Given below are two statements.
Statement I The decrease in first ionisation enthalpy from B to Al is much larger than that from Al to Ga.
Statement II The d-orbitals in Ga are completely filled.
In the light of the above statements, choose the most appropriate answer from the options given below. Show Answer

Q735) The geometry around boron in the product 'B' formed from the following reaction is Show Answer

Q736) The metal that has very low melting point and its periodic position is closer to a metalloid is Show Answer

Q737) Choose the correct stability order of group 13 elements in their + 1 oxidation state. Show Answer

Q738) In which one of the following molecules strongest back donations of an electron pair from halide to boron is expected? Show Answer

Q739) Given below are two statements:
Statement I Gallium is used in the manufacturing of thermometers.
Statement II A thermometer containing gallium is useful for measuring the freezing point (256 K) of brine solution.
In the light of the above statements. choose the correct answer from the options given below. Show Answer

Q740) Given below are two statements: one is labelled as
Assertion (A) and the other is labelled as Reason (R).
Assertion (A) Melting point of boron (2453 K) is unusually high in group 13 elements.
Reason (R) Solid boron has very strong crystalline lattice.
In the light of the above statements, choose the most appropriate answer from the options given below Show Answer

Q741) The incorrect statement from the following for borazine is Show Answer

Q742) Given below are two statements.
Statement I Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.
Statement II The green colour observed is due to the formation of copper (I) metaborate.
In the light of the above statements, choose the most appropriate answer from the options given below. Show Answer

Q743) Aqueous solutions of which of the following boron compounds will be strongly basic in nature? Show Answer

Q744) The correct statements among I to III regarding group 13 element oxides are:
I. Boron trioxide is acidic.
II. Oxides of aluminium and gallium are amphoteric.
III. Oxides of indium and thallium are basic. Show Answer

Q745) Which one of the following orders represents the correct sequence of the increasing basic nature of the given oxides? Show Answer

Q746) Among the following, the maximum covalent character is shown by the compound. Show Answer

Q747) Which one of the following is the correct statement? Show Answer

Q748) Heating of an aqueous solution of aluminium chloride to dryness will give Show Answer

Q749) Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in Show Answer

Q750) Alum is widely used to purify water since Show Answer

Q751) When metal 'M' is treated with NaOH, a white gelatinous precipitate 'X' is obtained, which is soluble in excess of NaOH. Compound 'X' when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal 'M' is Show Answer

Q752) Boron can't form which one of the following anions? Show Answer

Q753) The correct statement about diborone molecule is Show Answer

Q754) In order to prepare borazine, the ratio we need by diborane and ammonia is Show Answer

Q755) Which of the following material is not a semiconductor? Show Answer

Q756) Which one of the following compounds of group-14 elements is not known? Show Answer

Q757) The amorphous form of silica is Show Answer

Q758) The correct order of catenation is Show Answer

Q759) Which of the following exists as covalent crystals in the solid state? Show Answer

Q760) Given below are two statements.
Statement I The electronegativity of group 14 elements from Si to Pb, gradually decreases.
Statement II Group 14 contains non-metallic, metallic, as well as metalloid elements.
In the light of the above statements, choose the most appropriate from the options given below. Show Answer

Q761) Given below are two statements.
Statement I Stannane is an example of a molecular hydride.
Statement II Stannane is a planar molecule.
In the light of the above statement, choose the most appropriate answer from the options given below Show Answer

Q762) Compound A used as a strong oxidising agent amphoteric in nature. It is the part of lead storage batteries. Compound A is Show Answer

Q763) Water does not produce CO on reacting with Show Answer

Q764) 'X' melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is Show Answer

Q765) The basic structural unit of feldspar, zeolites, mica and asbestos is Show Answer

Q766) The correct statement among the following is Show Answer

Q767) Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is Show Answer

Q768) Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite Show Answer

Q769) Correct statements among (I) to (IV) regarding silicones are
I. They are polymers with hydrophobic character.
II. They are biocompatible.
III. In general, they have high thermal stability and low dielectric strength.
IV. Usually, they are resistant to oxidation and used as greases. Show Answer

Q770) The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence Show Answer

Q771) In silicon dioxide Show Answer

Q772) The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to Show Answer

Q773) Which of the following is the correct statements about silicones? Show Answer

Q774) The basic structural units of silicates are Show Answer