Practice Test

Q1) Which of the following statement is most appropriate about effective nuclear charge? It depends upon Show Answer

Q2) Which of the following pairs are chemically dissimilar? Show Answer

Q3) The element with atomic number 33 belongs to Show Answer

Q4) In the long form of the periodic table, the transition metals are placed in Show Answer

Q5) The valency of noble gas, in general, is Show Answer

Q6) Which of the following pair of atomic number represent s-block element? Show Answer

Q7) Which of the following gaseous ions contains maximum number of unpaired electrons ? Show Answer

Q8) The maximum tendency to form the gaseous unipositive ion is for the element with the configuration Show Answer

Q9) Which of the following elements has higher electron affinity? Show Answer

Q10) Which of the Following ions is smallest in size? Show Answer

Q11) Pauling's electronegativity values for elements are useful in predicting Show Answer

Q12) Among O, C, F, Cl, Br the correct order of increasing radii is Show Answer

Q13) Alkali metals in each period have Show Answer

Q14) The correct order of electron affinity of B,C,N,O is Show Answer

Q15) Which of the following has highest first ionisation potential ? Show Answer

Q16) Which one of the following arrangements does not represent the property indicated against it? Show Answer

Q17) Which of the following has least electron affinity? Show Answer

Q18) Ionisation energy is highest in Show Answer

Q19) The decreasing order of the ionisation potential of the following element is Show Answer

Q20) Which of the following order is correct for the first ionisation potential od B,C and N? Show Answer

Q21) An atom with high electronegativity has Show Answer

Q22) Ionic radii are Show Answer

Q23) The order of first ionisation energies of the element Li,Be,B, Na is Show Answer

Q24) The element with atomic number 55 belong to which block of the periodic table Show Answer

Q25) The correct order of electron affinity among the following is Show Answer

Q26) Which of the following set of atomic number belongs to that of alkali metals? Show Answer

Q27) Number of elements present in 5th period is Show Answer

Q28) Which of the following order of ionization energy is correct Show Answer

Q29) Which one of the following is incorrect statement? Show Answer

Q30) Which is true about the electronegativity order of the following? Show Answer

Q31) Four successive member of the first row transition elements are listed below with their atomic numbers. which one of them is expected to hav the highest third ionisation energy? Show Answer

Q32) Identify the correct order in which the covalent radius of the following element increase
(I)Ti (II)Ca (III)Sc Show Answer

Q33) Variable valency is generally exhibited by Show Answer

Q34) Which period of the table contains maximum number of elements Show Answer

Q35) The lighter metal is Show Answer

Q36) The ionisation energy of an atom is the energy Show Answer

Q37) Amongst the following elements which one has the greatest tendency to lose electron. Show Answer

Q38) Which of the following element has greatest tendency to lose electron? Show Answer

Q39) Which among the following element has lowest value of ionisation potential? Show Answer

Q40) In the second period of periodic table,the ionisation potential of element increase from left to right because of Show Answer

Q41) The attraction that an atom exerts on a pair of electrons that are being shared with another atom for forming covalent bond is referred to as its Show Answer

Q42) Which of the following element has the maximum electron affinity ? Show Answer

Q43) Which of the following configuration represent atoms of elements having the highest second ionisation energy? Show Answer

Q44) Which among the following species has the highest ionisation energy ? Show Answer

Q45) Which of the following order is wrong? Show Answer

Q46) For electron affinity of halogens which of the following is correct ? Show Answer

Q47) Which one of the following arrangements represent the correct order of electron gain enthalpy (with negative sign) of the given atomic species ? Show Answer

Q48) In the periodic table, the element with atomic number 16 will be placed in group Show Answer

Q49) In the modern long form of the periodic table, elements are arranged in the increasing order of Show Answer

Q50) In any period of the periodic table, valency of an element Show Answer

Q51) Eka-aluminium and Eka-silicon are known as Show Answer

Q52) Which of the following is most electronegative ? Show Answer

Q53) Electron affinity depends on Show Answer

Q54) In a given shell, the order of screening effect is Show Answer

Q55) The electronic configuration of four elements are given below. Which element does not belong to the same family? Show Answer

Q56) The first element of rare earth metal is Show Answer

Q57) The valence shell of transition elements consist of Show Answer

Q58) Element with atomic number 56 belong to which block ? Show Answer

Q59) The screening effect of d-electron is Show Answer

Q60) In the periodic table, with the increase in the atomic number the metallic character of the element Show Answer

Q61) Which of the following decrease in going down the halogen group? Show Answer

Q62) Among the following elements which one has the high value of first ioisation potential? Show Answer

Q63) The correct arrangement of increasing order of atomic radii among Na, K, Mg, Rb is Show Answer

Q64) Which of the following species has the highest ionisation potential ? Show Answer

Q65) The total number of inner transition elements is Show Answer

Q66) The properties of the elements are the periodic function of their atomic number. The statement is given by Show Answer

Q67) Which of the following pair belongs to same period of the periodic table? Show Answer

Q68) The elements with atomic number 26 will be found in group Show Answer

Q69) Which of the following pairs of atomic number represent elements belonging to the same group ? Show Answer

Q70) The electronic configuration of Gadolinium (Atomic number 64) is Show Answer

Q71) Which of the following represent elements in order of increasing atomic size ? Show Answer

Q72) Which of the following ions has the largest ions radius? Show Answer

Q73) Of the given alkali metals, the one with smallest size is Show Answer

Q74) The Melting point is lowest for Show Answer

Q75) Among the elements given below, the one with highest electropositivity is Show Answer

Q76) Which of the following elements is most electronegative? Show Answer

Q77) The electronegativity of the following elements increase in the order Show Answer

Q78) Which of the following oxide are neutral ? Show Answer

Q79) Which of the following arrangement show the correct order of decreasing paramagnetism? Show Answer

Q80) Which of the following is arranged in order of increasing density ? Show Answer

Q81) Which of the following is arranged in order of increasing density ? Show Answer

Q82) The basic strength of the hydroxide of the following alkaline earth metals follow the order Show Answer

Q83) Among the following elements, the second ionization energy is maximum for Show Answer

Q84) Among the following metals, the most dense is Show Answer

Q85) Which of the following is arranged in order of decreasing melting point ? Show Answer

Q86) Which of the following properties does not depend on periodicity? Show Answer

Q87) Among the following which has maximum density ? Show Answer

Q88) Which of the following is arranged in order of increasing second ionization energy? Show Answer

Q89) Which of the following is statement is correct? Show Answer

Q90) With which of the following configuration the lowest value of first IE is associated? Show Answer

Q91) which of the following configuration is associated with biggest jump between 2nd and 3rd IE? Show Answer

Q92) Which of the following metal requires radiation of highest frequency to cause emission of electron ? Show Answer

Q93) Which of the following does not reflect the periodicity of elements ? Show Answer

Q94) The number of element in the 4th period of periodic table is Show Answer

Q95) The oxide of which of the following elements will be acidic in character ? Show Answer

Q96) Which of the following isoelectronic ions has the lowest ionisation energy? Show Answer

Q97) The atomic radius increase as we move down a group because Show Answer

Q98) How does the ionisation energy of 1st group element vary ?
Show Answer

Q99) What is general outer electronic configuration of the coinage metals? Show Answer

Q100) Which of the following is isoeletronic with carbon atom? Show Answer

Q101) Which of the following electronic configuration is of transition elements ? Show Answer

Q102) The atomic radius of elements of which of these would be nearly same ? Show Answer

Q103) Gradual addition of electronic shell in the noble gases causes a decrease in their Show Answer

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

Q105) Which of the following has the smallest size ? Show Answer

Q106) The correct order of increasing ionic character ? Show Answer

Q107) Which one of the following is correct order of the size ? Show Answer

Q108) The ionisation potential is lower for the Show Answer

Q109) An element of atomic number 29 belong to which of the following block of the periodic table ? Show Answer

Q110) The element with highest electron affinity among the halogens is Show Answer

Q111) Which of the following is not isoelectronic ? Show Answer

Q112) Two elements whose electronegativities are 1.2 and 3.0, the bond formed between them would be Show Answer

Q113) With reference to ionisation potential which one of the following sets is correct ? Show Answer

Q114) The element with atomic number 9, 17, 35, 53, 85 are all Show Answer

Q115) Which one of the following groupings represent a collection of isoelectronic species ?
(Atomic number : Cs =55 , Br = 35) Show Answer

Q116) Which of the following ion has the highest value of ionic radius? Show Answer

Q117) In which of the following arrangements, the order is not according to the property indicated against it? Show Answer

Q118) Which of the following oxides is amphoteric in character ? Show Answer

Q119) Atomic radius of fluorine and neon (in Angstrom units) respectively are given as Show Answer

Q120) The electronegativity of the following elements increase the order Show Answer

Q121) Which of the following values in electron volt per atom represent the first ionisation energies of oxygen and nitrogen atom respectively? Show Answer

Q122) Which of the following is the smallest in size? Show Answer

Q123) The first ionisation potential of Na, Mg, Al and Si are in order Show Answer

Q124) Among the following element (whose electronic configurations are given below) the one having the highest ionisation energy is Show Answer

Q125) Which one of the following is correct order of increasing of size ? Show Answer

Q126) The correct order of electron affinity of the element of oxygen family in a periodic table is Show Answer

Q127) The statement that is not correct for the periodic classification of elements is Show Answer

Q128) Which one of the following has largest size ? Show Answer

Q129) The decreasing order of the second ionisation energy of K, Ca and Ba is
(Atomic number K = 19, Ca = 20, Ba = 56 ) Show Answer

Q130) The incorrect statement among the following is Show Answer

Q131) Ionic radii of Show Answer

Q132) The set representing the correct order of first ionisation potential is Show Answer

Q133) Identify the least stable ion among the following Show Answer

Q134) Which block 106th element belong to? Show Answer

Q135) Which of the following pairs show reverse properties on moving along a period from left to right and from top to down in group? Show Answer

Q136) Which among the following species have the same number of electrons in its outermost as well as penultimate shell? Show Answer

Q137) The size of the following species increase in the order Show Answer

Q138) Which of the following species has the highest electron affinity ? Show Answer

Q139) Which electronic configuration of an element has abnormally high difference second and third ionisation energy ? Show Answer

Q140) The incorrect statement among the following is Show Answer

Q141) Lattice energy of an ionic compound depends upon Show Answer

Q142) Which one of the following sets of ions represent collection of isoelectronic species ? Show Answer

Q143) The increase order of the first ionisation enthalpies of the elements B, P, S ans F (Lower first) is Show Answer

Q144) Following statement regarding the periodic trends of chemical reactivity of alkali metals and the halogens are given. Which of these statement gives the correct picture ? Show Answer

Q145) In which of the following arrangements, the sequence is not strictly according to the property written against ? Show Answer

Q146) The set representing the correct order of ionic radius id Show Answer

Q147) Born Haber cycle is used to determine: Show Answer

Q148) The element with strong electropositive nature is: Show Answer

Q149) Octet rule is not valid for the molecule: Show Answer

Q150) The correct order of reactivity of halogens is Show Answer

Q151) The screening effect of d-electrons is: Show Answer

Q152) Which has the largest first ionisation energy? Show Answer

Q153) In which of the following molecules are all the bonds not equal? Show Answer

Q154) The bond between two identical non-metal atoms has a pair of electrons: Show Answer

Q155) The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is: Show Answer

Q156) Which element of second period forms most acidic oxide? Show Answer

Q157) Which is correct in the following? Show Answer

Q158) The linear structure is possessed by: Show Answer

Q159) Which of the following has largest ionic radius? Show Answer

Q160) In the cyanide ion, the formal negative charge is on: Show Answer

Q161) The size of ionic species is correctly given in the order: Show Answer

Q162) Which statement is wrong? Show Answer

Q163) Which of the following atoms has minimum covalent radius? Show Answer

Q164) The second electron affinity is zero for Show Answer

Q165) For alkali metals, which one of the following trends is incorrect? Show Answer

Q166) If Aufbau rule is not followed, K-19 will be placed in Show Answer

Q167) The electronegativity order of O, F, Cl and Br is: Show Answer

Q168) Which has the minimum bond energy? Show Answer

Q169) In which of the following arrangements, the sequence is not strictly according to the property written against it? Show Answer

Q170) The tenth elements in the Periodic Table resembles with the Show Answer

Q171) Which is not the correct order for the stated property? Show Answer

Q172) The unequal sharing of bonded pair of electrons between two atoms in a molecule gives rise to: Show Answer

Q173) Which of the following oxides is most acidic in nature? Show Answer

Q174) The molecule having three folds of axis of symmetry is: Show Answer

Q175) The covalent compound HCl has the polar character because: Show Answer

Q176) If the bond has zero percent ionic character, the bond is: Show Answer

Q177) Mendeleef's Periodic Table is upset by the fact that Show Answer

Q178) The incorrect statement among the following is: Show Answer

Q179) Which one is correct? Show Answer

Q180) In which one of the following pairs the radius of the second species is greater than that of the first? Show Answer

Q181) Atomic radii of fluorine and neon in angstrom unit are respectively given by: Show Answer

Q182) According to IUPAC nomenclature, a newly discovered element has been named as Uun. The atomic number of the element is Show Answer

Q183) The correct order of increasing electron affinity of halogens is Show Answer

Q184) Al element X has 3 electrons in p-orbitals and also belongs to III period. Its molecular formula should be: Show Answer

Q185) Which of the following sequence regarding ionisation potential of coinage metal is correct: Show Answer

Q186) The bond length is maximum in: Show Answer

Q187) Which of the following is the most electropositive element? Show Answer

Q188) Which group of atoms have nearly same atomic radius? Show Answer

Q189) Which of the following statements is wrong? Show Answer

Q190) Which one of the following has the lowest ionisation energy? Show Answer

Q191) The set representing the correct order of first ionisation potential is: Show Answer

Q192) Which one of the following belongs to representative group of elements in the Periodic Table? Show Answer

Q193) 1, 3-butadiene has: Show Answer

Q194) Which of the following transitions involves maximum amount of energy? Show Answer

Q195) Which of the following molecular species has unpaired electron(s)? Show Answer

Q196) The element having lowest ionisation energy among the following is: Show Answer

Q197) Which will not conduct electricity? Show Answer

Q198) The bond order is maximum in: Show Answer

Q199) The screening effect of d-electros is Show Answer

Q200) Which is not linear? Show Answer

Q201) In which of the following bond angle is maximum? Show Answer

Q202) The molecule which has pyramidal shape is: Show Answer

Q203) The complex ion which has no 'd' electrons in the central metal atom is: Show Answer

Q204) For the formation of covalent bond, the difference in the value of electronegativities should be: Show Answer

Q205) Strongest bond is in: Show Answer

Q206) Which among the following has the largest dipole moment? Show Answer

Q207) Diagonal relationship is for Show Answer

Q208) Bond order of 1.5 is shown by: Show Answer

Q209) Which one of the following is an amphoteric oxide? Show Answer

Q210) Point out the wrong statement. On moving horizontally from left to right across a period in the Periodic Table Show Answer

Q211) The correct increasing bond angles order is: Show Answer

Q212) Concept of bond order in the molecular orbital theory depends on the number of electrons in the bonding and antibonding orbitals. The bond order: Show Answer

Q213) Which hybridization results non-polar orbitals? Show Answer

Q214) Intramolecular hydrogen bonding is found in: Show Answer

Q215) Amphoteric oxide combinations are in Show Answer

Q216) Chlorine atom tends to acquire the structure of: Show Answer

Q217) Which of the following ion is the smallest ion? Show Answer

Q218) Variable valency is characteristic of: Show Answer

Q219) Which force is strongest? Show Answer

Q220) Identify the transition element. Show Answer

Q221) For a covalent solid, the units which occupy lattice points are: Show Answer

Q222) Which is not true in case of ionic bond? Show Answer

Q223) The element which exists in both hard and soft form is: Show Answer

Q224) Resonance is not shown by: Show Answer

Q225) Dipole moment is highest for: Show Answer

Q226) In which of the following crystals of ionic compounds would you expect maximum distance between the centres of cotions and anions Show Answer

Q227) Which of the following has lowest bond angle? Show Answer

Q228) Among the following elements Ca, Mg, P and Cl the order of increasing atomic radius is: Show Answer

Q229) Alkali metals in each period have: Show Answer

Q230) For diatomic species are listed below. Identify the correct order in which the bond order is increasing in them: Show Answer

Q231) Which of the following is least ionic? Show Answer

Q232) The bond order of individual carbon-carbon bonds in benzene is: Show Answer

Q233) The set representing the correct order of ionic radius is: Show Answer

Q234) The pair having similar geometry is : Show Answer

Q235) The attraction that non-polar molecules have for each other is primarily caused by: Show Answer

Q236) The correct order of increasing oxidising power is Show Answer

Q237) Which of the following oxides is not expected to react with sodium hydroxide? Show Answer

Q238) Which element has the lowest electronegativity? Show Answer

Q239) Amongst the following elements the configuration having the highest ionization energy is: Show Answer

Q240) Which species does not exist? Show Answer

Q241) Which one of the following has not triangular pyramidal shape? Show Answer

Q242) Which is distilled first? Show Answer

Q243) The equilateral triangle shape has: Show Answer

Q244) Which atomic orbital is always involved in sigma bonding only? Show Answer

Q245) Two ice cubes are pressed over each other and unite to form one cube. Which force is responsible for holding them together? Show Answer

Q246) The bond that determines the secondary structure of a protein is: Show Answer

Q247) Which is not an exception to octet rule? Show Answer

Q248) Higher is the bond order, greater is: Show Answer

Q249) Highest electron affinity among the following is Show Answer

Q250) Which of the following has fractional bond order? Show Answer

Q251) The electrons used in bonding atoms: Show Answer

Q252) The discovery of which of the following group of elements gave death blow to the Newland's law of octaves? Show Answer

Q253) Generally, the first ionisation energy increases along a period. But there are some exceptions. One which is not an exception is Show Answer

Q254) Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? Show Answer

Q255) The basis of keeping the elements in the groups of The Periodic Table is Show Answer

Q256) The first four ionisation energy values of an element are 191, 578, 872 and 5962 kcal. The number of valence electrons in the element is Show Answer

Q257) Correct increasing order of first ionisation potential is Show Answer

Q258) Which pair represents isostructural species? Show Answer

Q259) The first ionisation potential (eV) of Be and B respectively are Show Answer

Q260) The correct order according to size is Show Answer

Q261) The correct order of electron affinity is Show Answer

Q262) Which of the following is a false statement? Show Answer

Q263) Solid NaCl is a bad conductor of electricity because: Show Answer

Q264) The correct order of ionisation energy for comparing carbon, nitrogen and oxygen is Show Answer

Q265) Boron cannot form which one of the following anions? Show Answer

Q266) Most covalent halide of aluminium is: Show Answer

Q267) The correct order of increasing bond angles in the following triatomic species is: Show Answer

Q268) Which of the following pairs has both members from the same group of the Periodic Table? Show Answer

Q269) Silicon has 4 electrons in the outermost orbit. In forming the bond: Show Answer

Q270) A p-block element in which last electron enters into s-orbitals of valence shell instead of p-orbital is: Show Answer

Q271) Which of the following are not correct? Show Answer

Q272) The order of first ionisation energies of the element Li, Be, B, Na is Show Answer

Q273) Differentiating electron in inner transition elements enters the………….. orbital. Show Answer

Q274) Which is expected to conduct electricity? Show Answer

Q275) Elements whose electronegativities are 1.2 and 3.0, form: Show Answer

Q276) Oxygen is divalent, but sulphur exhibits variable valency of 2, 4 and 6, because: Show Answer

Q277) In the Periodic Table, going down in the fluorine group Show Answer

Q278) The ionisation energy of nitrogen is larger than that of oxygen because of Show Answer

Q279) Which has the highest ionisation potential? Show Answer

Q280) Which of the following does not represents the correct order of the property indicated? Show Answer

Q281) The electronic configuration of most electronegative elements is Show Answer

Q282) Which group of the Periodic Table does not contain only metals? Show Answer

Q283) Which of the following is a metalloid? Show Answer

Q284) Which of the following have highest electron affinity? Show Answer

Q285) The correct order of increasing electropositive character among Cu, Fe and Mg is: Show Answer

Q286) As one moves along a given row in the Periodic Table, ionisation energy Show Answer

Q287) The lightest metal is Show Answer

Q288) Which is the property of non-metal? Show Answer

Q289) In a given shell the order of screening effect is Show Answer

Q290) Which of the following statements is correct? Show Answer

Q291) Number of elements presents in the fifth period of periodic table is Show Answer

Q292) The compound possessing most strongly ionic nature is: Show Answer

Q293) What is the name of element with atomic number 105? Show Answer

Q294) Among the following which is the strongest oxidising agent? Show Answer

Q295) The outermost electronic configuration of the most electronegative element is Show Answer

Q296) The incorrect statements regarding bonding molecular orbitals because: Show Answer

Q297) Which of the following has largest size? Show Answer

Q298) Which one of the elements has the maximum electron affinity? Show Answer

Q299) Which one of the following process requiring absorption of energy? Show Answer

Q300) The hybridization of carbon in diamond, graphite and acetylene is: Show Answer

Q301) Which ionisation potential (IP) in the following equations involves the greatest amount of energy? Show Answer

Q302) The pairs of bases in DNA are held together by: Show Answer

Q303) Who developed the long form of Periodic Table? Show Answer

Q304) At ordinary temperature and pressure, among halogens, the chlorine is a gas, bromine is a liquid and iodine is a solid. This is because: Show Answer

Q305) Which of the following relation is correct? Show Answer

Q306) Which has higher bond energy and stronger bond? Show Answer

Q307) The example of the p-p-orbital overlapping is the formation of: Show Answer

Q308) Which of the following species has four lone pairs of electrons in its outer shell? Show Answer

Q309) Which transition involves maximum amount of energy? Show Answer

Q310) The order of stability of metal oxides is Show Answer

Q311) The first ionisation potential of Na, Mg, Al and Si are in the order Show Answer

Q312) Which of the following two are isostructural? Show Answer

Q313) Which of the following metal oxides is most basic? Show Answer

Q314) Which of the following phenomenon will occur when two atoms of same spin will react? Show Answer

Q315) The maximum valency of an element with atomic number 7 is Show Answer

Q316) Which of the following compounds has the lowest melting point? Show Answer

Q317) Nitrogen dioxide cannot be prepared by heating Show Answer

Q318) Which of the following is correct order of increasing size? Show Answer

Q319) The correct order of bond angles is: Show Answer

Q320) Among the following metals interatomic forces are probably weakest in: Show Answer

Q321) The element with atomic number 117 if discovered would be placed in Show Answer

Q322) The element with atomic numbers 9, 17, 35, 53, 85 are all Show Answer

Q323) Acetic acid exists as dimer in benzene due to: Show Answer

Q324) In which of the following arrangements the order is not correct according to property indicated against it? Show Answer

Q325) The forces present in the crystals of naphthalene are: Show Answer

Q326) Which has zero dipole moment? Show Answer

Q327) Which group of the Periodic Table contains coinage metal? Show Answer

Q328) Ionisation potential values of 'd' block elements as compared to ionisation potential values of 'f' block elements are: Show Answer

Q329) An element with atomic number 20 will be placed in which period of the Periodic Table? Show Answer

Q330) The correct order of ionisation energy for comparing carbon, nitrogen and oxygen atom is Show Answer

Q331) In which of the following arrangements the order is not according to the property indicated against it? Show Answer

Q332) Pauling received Nobel Prize for his work on: Show Answer

Q333) For electron affinity of halogens, which of the following is correct? Show Answer

Q334) The correct electronegativity order is: Show Answer

Q335) Which of the following properties show gradual decrease with increase in atomic number across a period in the Periodic Table? Show Answer

Q336) Two lone pairs of electrons and two bond pairs are present in Show Answer

Q337) The lattice energy order for lithium halide is: Show Answer

Q338) The correct increasing order off polarising power is: Show Answer

Q339) Increase in atomic size down the group is due to Show Answer

Q340) When the first ionisation energies are plotted against atomic number, the peaks are occupied by Show Answer

Q341) Which of the following is non-metallic? Show Answer

Q342) Which compound does not contain double bond or triple bond? Show Answer

Q343) Which is soluble in water? Show Answer

Q344) Highest energy will be absorbed to eject out the electron in the configuration Show Answer

Q345) Most acidic oxide is Show Answer

Q346) Each of the followings has non-zero dipole moment, except: Show Answer

Q347) H-bonding is not present in: Show Answer

Q348) Which formulae does not correctly represent the bonding capacity of the atom involved? Show Answer

Q349) The higher values of specific heat of water in comparison to other liquids is due to: Show Answer

Q350) Which one of the following combinations represents a metallic element? Show Answer

Q351) Which bond has the highest bond energy? Show Answer

Q352) The increasing order of first ionisation enthalpies of the elements B, P, S and F (lowest first) is Show Answer

Q353) Which of the following pairs are isostructural? Show Answer

Q354) The electronic configuration of transition elements is exhibited by Show Answer

Q355) The first ionisation energy of oxygen is less than that of nitrogen. Which of the following is the correct reason for this observation? Show Answer

Q356) Which is likely to have the highest melting point? Show Answer

Q357) Valency means: Show Answer

Q358) Which of the following has highest bond angle? Show Answer

Q359) The halogen that most easily reduced is Show Answer

Q360) The enhanced force of cohesion in metals is due to: Show Answer

Q361) Which contains both polar and non-polar covalent bonds? Show Answer

Q362) Electron deficient species are known as: Show Answer

Q363) Metallic bonds do not play a role in: Show Answer

Q364) Pauling's electronegativity values for elements are useful in predicting: Show Answer

Q365) Among the following elements, the most electronegative is: Show Answer

Q366) The correct order of decreasing first ionization potential is: Show Answer

Q367) Ionization potential of Na would be numerically the same as: Show Answer

Q368) Dipole moment is exhibited by: Show Answer

Q369) In the Periodic Table metals usually used as catalyst belong to Show Answer

Q370) Four diatomic species are listed below in different sequences. Which of these represents the correct order of their increasing bond order? Show Answer

Q371) The increase in bond order results in: Show Answer

Q372) In which molecule all atoms are coplanar? Show Answer

Q373) Which of the following species has a linear shape? Show Answer

Q374) Which represents a collection of isoelectronic species? Show Answer

Q375) In which of the following molecules/ions are all the bonds not equal? Show Answer

Q376) Which has the highest bond energy? Show Answer

Q377) According to MO theory, which of the following lists ranks the nitrogen species in terms of increasing bond
order? Show Answer

Q378) Be resembles much with Show Answer

Q379) The pair of species with the same bond order is: Show Answer

Q380) Which molecule is planar? Show Answer

Q381) Which is present in peroxides? Show Answer

Q382) The number of valency electrons in carbon atom is: Show Answer

Q383) Which does not form two or more chlorides? Show Answer

Q384) In coordinate bond, the acceptor atoms must essentially contain in its valency shell an orbitals: Show Answer

Q385) Which one of the following statement is false? Show Answer

Q386) Which of the following halides is most acidic? Show Answer

Q387) Identify the correct order in which the covalent radius of the following elements increases
(I) Ti
(II) Ca
(III) Sc Show Answer

Q388) Which is chemically most active non-metal? Show Answer

Q389) Electron affinity is the Show Answer

Q390) Which is paramagnetic? Show Answer

Q391) The bond length of LiF will be Show Answer

Q392) The bond order of CO molecule on the basis of molecular orbital theory is: Show Answer

Q393) The predominent intermolecular forces in hydrogen fluoride is due to: Show Answer

Q394) Which of the following species does not exist under normal conditions? Show Answer

Q395) An element with atomic number 21 is a Show Answer

Q396) Linear combination of two hybridized orbitals, belonging to two atoms and each having one electron leads to: Show Answer

Q397) Which one of the following oxides is amphoteric in character? Show Answer

Q398) The correct order in which the first ionisation potential increases is Show Answer

Q399) The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is Show Answer

Q400) As the s-character of hybridization orbitals increases, the bond angle: Show Answer

Q401) Dipole-dipole attractive forces are strongest between the molecules of: Show Answer

Q402) If the IP of Na is 5.48 eV, the ionisation potential of K will be Show Answer

Q403) The electronic configuration of the atom having maximum difference in first and second ionisation energies is Show Answer

Q404) Pick the odd man out (The one having zero dipole moment): Show Answer

Q405) The property of attracting electrons by the halogen atoms in a molecule is called Show Answer

Q406) Which among the following elements has lowest value of ionisation energy? Show Answer

Q407) The pair of elements which on combination are most likely to form an ionic compound is: Show Answer

Q408) A molecule which cannot exist theoretically is: Show Answer

Q409) A sudden large jump between the values of second and third ionisation energies of an element would be associated with the electronic configuration Show Answer

Q410) The correct order of radii is: Show Answer

Q411) The ionic radius of 'Cr' is minimum in which of the following compounds? Show Answer

Q412) Which molecule has trigonal planar geometry? Show Answer

Q413) Which is the general outer electronic configuration of the coinage metals? Show Answer

Q414) The values of electronegativity of atom A and B are 1.20 and 4.0 respectively. The percentage of ionic character of A- B bond is Show Answer

Q415) Which of the following element is most electropositive? Show Answer

Q416) Super octet molecule is: Show Answer

Q417) Which of the following elements will have the lowest first ionisation energy? Show Answer

Q418) The diamagnetic molecules are: Show Answer

Q419) Which of the following electronic configuration represents noble gas? Show Answer

Q420) The number of naturally occurring p- block elements that are diamagnetic is Show Answer

Q421) Which of the following element shows maximum valency? Show Answer

Q422) The pair likely to form the strongest hydrogen bonding: Show Answer

Q423) Highest covalent character is found in which of the following? Show Answer

Q424) Which element has the highest electronegativity? Show Answer

Q425) Metallic nature and basic nature of the oxides…… as we move along a period Show Answer

Q426) In which block does 106th element belong? Show Answer

Q427) Which of the following is more ionic? Show Answer

Q428) Which one of the following orders is not in according with the property stated against it? Show Answer

Q429) Which one is electron deficient compound? Show Answer

Q430) Which of the following is largest ion? Show Answer

Q431) Which of the following has the minimum bond length? Show Answer

Q432) Ionisation energy in group 1-A varies in the decreasing order as Show Answer

Q433) Paramagnetism is exhibited by molecules: Show Answer

Q434) The value of bond order in nitrogen and oxygen molecule is: Show Answer

Q435) In third row of Periodic Table, the atomic radii from Na to Cl Show Answer

Q436) Which has a giant covalent structure? Show Answer

Q437) Which has an odd electron and shows paramagnetic character? Show Answer

Q438) When an electron is removed from an atom, its energy Show Answer

Q439) As a result of resonance: Show Answer

Q440) Polar covalent compounds are soluble in: Show Answer

Q441) The elements with atomic numbers 9, 17, 35, 53, 85 are all Show Answer

Q442) Which among the following has highest ionic radius? Show Answer

Q443) Strongest bond is formed by the head on overlapping of: Show Answer

Q444) The element having highest electron affinity is Show Answer

Q445) Fluorine has low electron affinity than chlorine because of Show Answer

Q446) The angle between two covalent bonds is maximum in: Show Answer

Q447) Which species has lone pair on central atom? Show Answer

Q448) Which contains both covalent and ionic bonds? Show Answer

Q449) The orbitals of same energy level providing the most efficient overlapping are: Show Answer

Q450) Which of the following has unchanged valency? Show Answer

Q451) The general electronic configuration of the transition elements is Show Answer

Q452) The order of first electron affinity of O, S and Se is: Show Answer

Q453) Which of the following oxides doesn't react with both of an acid and alkali, is? Show Answer

Q454) Which of the following is isoelectronic with carbon atom? Show Answer

Q455) Which of the following sequence correctly represents the decreasing acidic nature of oxides? Show Answer

Q456) In which o the following compounds, the bonds have the largest percentage of ionic character: Show Answer

Q457) Which ion has a higher polarizing power? Show Answer

Q458) The first ionisation potential is maximum for Show Answer

Q459) The highest first ionisation potential is of Show Answer

Q460) In a multi-electron atom, the energy of a 2 p-orbital is : Show Answer

Q461) The high boiling point of water is due to: Show Answer

Q462) Variable valency in general, is exhibited by Show Answer

Q463) Which statement is true? Show Answer

Q464) The bond strength increases: Show Answer

Q465) Which species is paramagnetic? Show Answer

Q466) Chemical bond formation takes place when: Show Answer

Q467) Which has the smallest size? Show Answer

Q468) Observe the following statement
I. The physical and chemical properties of elements are periodic functions of their electronic
configuration.
II. Electronegativity of fluorine is less than the electronegativity of chlorine.
III. Electropositive nature decreases from top to bottom in a group.
The correct answer is Show Answer

Q469) The only non-metal which is liquid at ordinary temperature is Show Answer

Q470) Which has triangular planar shape? Show Answer

Q471) With respect to chlorine, hydrogen will be Show Answer

Q472) In the case of alkali metals, the covalent character decreases in the order: Show Answer

Q473) Which element has maximum electron affinity? Show Answer

Q474) Ionisation potential is lowest for Show Answer

Q475) It is thought that atoms combine with each other such that the outermost orbit acquires a stable configuration of 8 electrons. If stability were attained with 6 electrons rather than with 8, what would be the formula of the stable fluoride ions? Show Answer

Q476) The outermost configuration of the least reactive element is Show Answer

Q477) Elements of the same vertical group of the Periodic Table have Show Answer

Q478) Ionisation potential for a noble gas is Show Answer

Q479) Which of the following possess maximum hydration energy? Show Answer

Q480) Following statements regarding the periodic trends of chemical reactivity to the alkali metals and the halogens are given. Which of these statements gives the correct picture? Show Answer

Q481) Which has minimum ionic radius? Show Answer

Q482) The ionisation potential order for which set is correct? Show Answer

Q483) The correct sequence which shows decreasing order of the ionic radii of the elements is Show Answer

Q484) Among HX, the maximum dipole moment is of: Show Answer

Q485) Ice has an open structure compared to water due to which it floats on water and occupies a greater volume of space. The open structure of ice is due to: Show Answer

Q486) The electrons in an incomplete outershell are known as : Show Answer

Q487) Which of the following is not a correct statement? Show Answer

Q488) Van der Waals' forces are applied to: Show Answer

Q489) The correct order of dipole moment is: Show Answer

Q490) Which of the following species contains three bond pairs and one lone pair around the central atom? Show Answer

Q491) Which statement is correct? Show Answer

Q492) Which is highest melting point halide? Show Answer

Q493) Elements of which group form anions most readily? Show Answer

Q494) Which is not a scale of measuring electronegativity? Show Answer

Q495) In the series ethane, ethylene and acetylene, the C - H bond energy is : Show Answer

Q496) The correct order of increasing bond angles in the following species is: Show Answer

Q497) In the Periodic Table metallic character of elements shows one of the following trend Show Answer

Q498) When sodium and chlorine react, energy is: Show Answer

Q499) In third row of Periodic Table from Na to Cl Show Answer

Q500) The molecule having smallest bond angle is: Show Answer

Q501) Which of the following statements regarding carbon monoxide is correct? Show Answer

Q502) The hydration of ionic compounds involves: Show Answer

Q503) Which of the following is the atomic number of a metal? Show Answer

Q504) Which statement is correct? Show Answer

Q505) The correct order of size of iodine species is Show Answer

Q506) Which of the following statement is wrong? Show Answer

Q507) Methanol and ethanol are miscible in water due to: Show Answer

Q508) Among the following, the number of elements showing only one non-zero oxidation state is O, Cl, F, N, P, Sn, Tl, Na, Ti Show Answer

Q509) The correct decreasing order of first ionisation enthalpies of five elements of the second period is Show Answer

Q510) The correct order of second ionisation potential of carbon, nitrogen, oxygen and fluorine is: Show Answer

Q511) Of the following elements, which one has the highest electronegativity? Show Answer

Q512) The hydrogen bonding is strongest in: Show Answer

Q513) In which of the following process energy is liberated? Show Answer

Q514) A covalent bond is formed between the atoms by the overlapping of orbitals containing:
Show Answer

Q515) Which main group elements have a different number of outermost electrons than their group number? Show Answer

Q516) Which one of the following has the highest electronegativity? Show Answer

Q517) Which property is commonly exhibited by a covalent compound? Show Answer

Q518) The energy of antibonding molecular orbitals is: Show Answer

Q519) An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number is: Show Answer

Q520) How does the ionisation energy of 1st group elements vary? Show Answer

Q521) Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)? Show Answer

Q522) Which shows the highest lattice energy? Show Answer

Q523) Which does not have pyramidal geometry? Show Answer

Q524) Dative bond is present in: Show Answer

Q525) Which of the following halides is least stable and has doubtful existence? Show Answer

Q526) Which property of halogens increases from F to I? Show Answer

Q527) Which has highest melting point? Show Answer

Q528) Which of the following phenomenon will occur when two atoms of an element with same spin of electron in orbitals approach each other? Show Answer

Q529) The least stable ion among the following is Show Answer

Q530) The electron affinity values for the halogens show the following trend Show Answer

Q531) The elements present in the core of earth are collectively known as Show Answer

Q532) In the Modern Periodic Table, elements are arranged Show Answer

Q533) Which of the ions has the largest ionic radius? Show Answer

Q534) Which compound shows hydrogen bonding? Show Answer

Q535) The ionization potential order for which set is correct? Show Answer

Q536) Which shows non-directional bonding? Show Answer

Q537) Maximum number of covalent bonds between two like atoms can be: Show Answer

Q538) Bond energy of covalent O - H bond in water is : Show Answer

Q539) Which is expected to show paramagnetism? Show Answer

Q540) Which pair has both members from the same period of Periodic Table? Show Answer

Q541) The half of the difference between the number of electrons in bonding molecular orbitals and antibonding molecular orbitals is known as: Show Answer

Q542) Which can be described as a molecule with residual bonding capacity? Show Answer

Q543) The intermolecular attractive forces vary in the order: Show Answer

Q544) Which have zero dipole moment? Show Answer

Q545) When ionic compounds get dissolved in water: Show Answer

Q546) Which one of the following elements has the highest ionisation energy? Show Answer

Q547) In allene structure, three carbon atoms are joined by: Show Answer

Q548) Which of the following pairs show reverse properties on moving along a period from left to right and from top to down in a group? Show Answer

Q549) Covalent radius of Li is 123 pm. The crystal radius of Li will be: Show Answer

Q550) Bond length decreases with: Show Answer

Q551) Which of the following statements is most correct?
Effective nuclear charge of an atom depends on: Show Answer

Q552) Which of the following oxides is most basic? Show Answer

Q553) Which one of the following ions has the highest value of ionic radius? Show Answer

Q554) Which has the lowest bond angle? Show Answer

Q555) Pauling's electronegativity values for elements are useful in predicting Show Answer

Q556) The correct order of decreasing polarisability of ion is: Show Answer

Q557) Strongest oxidising agent among halogen is Show Answer

Q558) Which contains a coordinate and covalent bond? Show Answer

Q559) Which of the following acts sometimes as a metal and sometimes as a non-metal? Show Answer

Q560) The lowest ionization energy would be associated with the electronic structure: Show Answer

Q561) IP is influenced by: Show Answer

Q562) Which of the following characteristics regarding halogens is not correct? Show Answer

Q563) Which of the following is correct? Show Answer

Q564) Molecular orbitals theory was proposed by: Show Answer

Q565) Proton plays an important role in … bonding . Show Answer

Q566) Which cannot exist on the basis of M. O. theory? Show Answer

Q567) Which of the following statement is correct? Show Answer

Q568) The double bonds between the two carbon atoms in ethylene consists of: Show Answer

Q569) Which compound among the following has more covalent character? Show Answer

Q570) Iron is tougher than sodium because: Show Answer

Q571) In HCHO carbon atom has hybridisation: Show Answer

Q572) Amongst the elements with following electronic configurations, which one of them may have the highest ionization energy? Show Answer

Q573) In which pair, the first atom or ion is not larger than the second? Show Answer

Q574) The correct order of ionic radii is: Show Answer

Q575) Greater the dipole moment: Show Answer

Q576) First ionisation energy is highest for Show Answer

Q577) According to the Periodic Law of elements, the variation in properties of elements is related to their Show Answer

Q578) The angle between the overlapping of one s-orbital and one p-orbital is: Show Answer

Q579) The ionisation energy will be maximum for the process: Show Answer

Q580) Ionization energy of nitrogen is more than oxygen because: Show Answer

Q581) One would expect the elemental form of Cs at room temperature to be: Show Answer

Q582) The carbon atom in graphite is: Show Answer

Q583) Which involves a bond forming process? Show Answer

Q584) Which element has highest electronegativity? Show Answer

Q585) The trivalent ion having largest size in lanthanide series is Show Answer

Q586) When an element of very low ionisation potential is allowed to react with an element of very high electron affinity, we get: Show Answer

Q587) Which of the following is an amphoteric oxide? Show Answer

Q588) In which element shielding effect is not possible? Show Answer

Q589) Polarization of electrons in acrolein may be written as: Show Answer

Q590) Which one is the weakest bond? Show Answer

Q591) Which has the lowest anion to cation size ration? Show Answer

Q592) Which set has strongest tendency to form anions? Show Answer

Q593) Which one is most polar? Show Answer

Q594) Acetate ion contains: Show Answer

Q595) Which of the following isoelectronic ions has lowest ionisation energy? Show Answer

Q596) In the electronic structure of acetic acid there are: Show Answer

Q597) Van der Waals' forces between molecules depend upon: Show Answer

Q598) Among NaF, NaCl, NaBr and NaI, the NaF has highest melting point because : Show Answer

Q599) Which does not show hydrogen bonding? Show Answer

Q600) A trend common to both group I and VII elements in the Periodic Table as atomic number increases is Show Answer

Q601) Which among the following elements has lowest value of ionisation energy? Show Answer

Q602) Which of the atomic number pairs represents elements of s-block? Show Answer

Q603) The correct order of decreasing first ionisation energy is Show Answer

Q604) The total number of bonds in acetylene molecules is: Show Answer

Q605) The elements X, Y, Z and T have the indicated electronic configuration. Starting with the innermost shell, which is the most metallic element? Show Answer

Q606) Maximum covalence of an atom of an element is equal to: Show Answer

Q607) Which of the following has shortest carbon-carbon bond length? Show Answer

Q608) Which of the following is largest? Show Answer

Q609) Which p-orbitals overlapping would give the strongest bond? Show Answer

Q610) Which of the following statements is wrong? Show Answer

Q611) In which one of the following species, the central atom has the type of hybridization which is not the same as that present in other three? Show Answer

Q612) Which is correct order for electron gain enthalpy? Show Answer

Q613) The first ionisation energy of lithium will be Show Answer

Q614) When two atomic orbitals combine, they form: Show Answer

Q615) The set representing the correct order of first ionisation energy is Show Answer

Q616) The electronic configuration of the element with maximum electron affinity is Show Answer

Q617) Which of the following has regular tetrahedral shape? Show Answer

Q618) The smallest among the following ions is Show Answer

Q619) Coordinate compounds are formed by: Show Answer

Q620) The statement that is true for the long form of the Periodic Table is Show Answer

Q621) Which of the following elements never show positive oxidation number? Show Answer

Q622) The energy released when a neutral gaseous atom takes up an electron is called: Show Answer

Q623) Which one of the following is expected to have largest size? Show Answer

Q624) Debye an unit of dipole moment is of the order of: Show Answer

Q625) Which one of the following elements has lower value of ionisation energy? Show Answer

Q626) Identify the least stable ion amongst the following: Show Answer

Q627) For the type of interactions:
(I) Covalent bond,
(II) van der Waals' forces,
(III) Hydrogen bonding,
(IV) Dipole - dipole interaction,
Which represents the correct order of increasing stability? Show Answer

Q628) According to Fajan's rule polarization is more when: Show Answer

Q629) Which is correct about ionisation potential? Show Answer

Q630) A sudden large jump between the value of first and second ionisation energies of elements would be associated with which of the following electronic configurations? Show Answer

Q631) The pair of amphoteric hydroxides is Show Answer

Q632) Which one has more tendency to form covalent compounds? Show Answer

Q633) The electron affinity for inert gases is likely to be: Show Answer

Q634) Increasing order (lower first) of size of the various hybridised orbitals is: Show Answer

Q635) Shape of molecules is decided by: Show Answer

Q636) Which statement is wrong? Show Answer

Q637) Which one of the following has maximum ionisation potential? Show Answer

Q638) Which is the correct order of electronegativity? Show Answer

Q639) Which of the following has maximum bond energy? Show Answer

Q640) Hydrogen fluoride is a liquid unlike other hydrogen halides because: Show Answer

Q641) The O - H bond distance in water molecule is: Show Answer

Q642) Van der Waals' forces are maximum in: Show Answer

Q643) The increasing order of the ionic radii of the given isoelectronic species is: Show Answer

Q644) Which of the following exhibits diamagnetic behavior? Show Answer

Q645) The electronic configuration of sodium and chlorine justifies: Show Answer

Q646) The correct order of radii is Show Answer

Q647) The compound showing maximum covalent character is: Show Answer

Q648) In which of the following pairs the two species are not isostructural? Show Answer

Q649) The pair of species having identical shape of both species: Show Answer

Q650) Which of the following halogen acids is least basic? Show Answer

Q651) Beryllium shows diagonal relationship with Show Answer

Q652) The compound with the maximum dipole moment among the following is: Show Answer

Q653) Which of the following molecules is covalent and shows expanded octet in its formation? Show Answer

Q654) Correct order of first ionisation potential among the following elements Be, B, C, N, O is Show Answer

Q655) For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be Show Answer

Q656) Which of the following pairs has both members of the same period of the Periodic Table? Show Answer

Q657) The increasing order of the first ionization enthalpies of the elements B, P, S and F (lower first) is: Show Answer

Q658) Which of the following element has higher ionisation energy? Show Answer

Q659) The correct order of acidic strength Show Answer

Q660) Which of the following element is metalloid? Show Answer

Q661) Which of the following metals exhibits more than one oxidation state? Show Answer

Q662) Among the following which has the highest cation to anion size ratio? Show Answer

Q663) The correct order of ionic radius is Show Answer

Q664) An electrovalent compound does not exhibit space isomerism due to: Show Answer

Q665) The element with the lowest ionisation potential is Show Answer

Q666) Which has the largest distance between the carbon hydrogen atom? Show Answer

Q667) Which one pair of atoms or ions will have same configuration? Show Answer

Q668) Atoms or group of atoms which are electrically charged are known as: Show Answer

Q669) The element with atomic number 36 belongs to …block in the Periodic Table. Show Answer

Q670) Which bond is more polar? Show Answer

Q671) If the electronegativity difference between two atoms A and B is 2.0, then the percentage of covalent character in the molecule is Show Answer

Q672) In the following, the element with the highest ionisation energy is Show Answer

Q673) Ionization potential is lowest for: Show Answer

Q674) Electron affinity is positive, when Show Answer

Q675) A bond with maximum covalent character between non-metallic elements is formed: Show Answer

Q676) In a crystal, the atoms are located at the positions of: Show Answer

Q677) Water has high heat of vaporization due to: Show Answer

Q678) Stability of hydrides generally increases with: Show Answer

Q679) Which one is the strongest bond? Show Answer

Q680) The metal having highest melting point is? Show Answer

Q681) Which one species has the longest bond length? Show Answer

Q682) The correct order regarding the electronegativity of hybrid orbitals of carbon is: Show Answer

Q683) The pair of elements having approximately equal ionisation potential is Show Answer

Q684) Elements having six electrons in its outermost orbit generally form: Show Answer

Q685) Which of the following is false? Show Answer

Q686) In a double bond connecting two atoms there is a sharing of: Show Answer

Q687) As we go from left to right in period two of the Periodic Table, gram atomic volume of the elements Show Answer

Q688) Which of the following bond requires the largest amount of energy to dissociate the bond concerned? Show Answer

Q689) Which does not show inert pair effect? Show Answer

Q690) Resonance is due to: Show Answer

Q691) The ICl molecule is: Show Answer

Q692) The lowest bond energy exist in the following bonds for: Show Answer

Q693) Which of the following electronic configurations in the outermost shell is characteristic of alkali metals? Show Answer

Q694) In dry ice there are … in between molecules. Show Answer

Q695) The solubility of KCl is relatively more in (where D is dielectric constant): Show Answer

Q696) The Ist IEs of four consecutive elements present in the second period of Periodic Table are 8.3, 11.3, 14.5 and 13.6 eV respectively. Which of these is the IE of nitrogen? Show Answer

Q697) Which oxide is amphoteric in nature? Show Answer

Q698) The correct ionic radii order is: Show Answer

Q699) Which is a good solvent for ionic and polar covalent compounds? Show Answer

Q700) For which of the following hybridization the bond angle is maximum? Show Answer

Q701) Which of the following does not involve covalent bond? Show Answer

Q702) The correct increasing covalent nature is: Show Answer

Q703) The bond between atoms of two elements of atomic number 37 and 53 is: Show Answer

Q704) The species having octahedral shape is: Show Answer

Q705) Which of the following is not isoelectronic? Show Answer

Q706) In which of the following gaseous molecules, the ionic character of the covalent bond is greatest? Show Answer

Q707) Chlorine atom differs from chloride ion in the number of: Show Answer

Q708) Which molecule is T-shaped? Show Answer

Q709) Organic compounds soluble in water contain: Show Answer

Q710) Which of the following is most stable? Show Answer

Q711) Which of the following sets represents the collection of isoelectronic species? Show Answer

Q712) Which one of the following sets of ions represents a collection of isoelectronic species? Show Answer

Q713) Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species? Show Answer

Q714) Which of the following molecules does not possess a permanent electric dipole moment? Show Answer

Q715) The molecule having permanent dipole moment is: Show Answer

Q716) Statement 1: Manganese has a less favourable electron affinity than its neighbours in either side.
Statement 2: The magnitude of an element's electron affinity depends on the element's valence shell electrons configuration. Show Answer

Q717) Statement 1: The electron attachment enthalpy of fluorine is more negative than that of chlorine.
Statement 2: All alkaline earth and noble gas elements have positive value of electron attachment enthalpies. Show Answer

Q718) Statement 1: Atomic size of silver is almost equal to that of gold.
Statement 2: d-subshell has low penetration power and produce poor shielding. Show Answer

Q719) Statement 1: In any period, the radius of the noble gas is lowest.
Statement 2: He has the highest IE in the Periodic Table. Show Answer

Q720) Statement 1: First ionization energy for nitrogen is lower than oxygen.
Statement 2: Across a period effective nuclear charge decreases. Show Answer

Q721) Statement 1: The first ionization energy of Be is greater than B.
Statement 2: 2p- orbitals have lower energy than 2s- orbitals Show Answer

Q722) Statement 1: Known elements may contain as many as 32 electrons in an energy level but only s and p sublevel electrons are considered for the octet rule.
Statement 2: For any atom, electrons present in s- and p- subshells assume greater stability. Show Answer

Q723) Statement 1: Plutonium among the transuranic elements is the longest lived element.
Statement 2: Plutonium is not radioactive. Show Answer

Q724) Statement 1: Sulphur atom has higher electron affinity than oxygen.
Statement 2: Oxygen is more electronegative than sulphur, that's why can hold electron better. Show Answer

Q725) Statement 1: Nobel gases have large positive electron gain enthalpy.
Statement 2: Electron has the enter the next higher principal quantum level. Show Answer

Q726) Statement 1: Shielding effect increases as we go down the group.
Statement 2: More is the electrons in the penultimate shell, more is shielding. Show Answer

Q727) Statement 1: Isoelectronic species are having same number of electrons but different radii.
Statement 2: Higher the charge, smaller the ion. Show Answer

Q728) Given below are two statements:
Statement I The 4f and 5f-series of elements are placed separately in the periodic table to preserve principle of classification.
Statement II s-block elements can be found in pure form in nature.
In the light of the above statements, choose the most appropriate answer from the options given below Show Answer

Q729) The metal that has very low melting point and its periodic position is closer to a metalloid is Show Answer

Q730) Which of the following elements is considered as a metalloid? Show Answer

Q731) Which one of the following statements for D.I. Mendeleev, is incorrect? Show Answer

Q732) The set of elements that differ in mutual relationship from those of the other sets is Show Answer

Q733) The atomic number of the element unnilennium is Show Answer

Q734) The group number, number of valence electrons and valency of an element with atomic number 15, respectively, are Show Answer

Q735) The IUPAC symbol for the element with atomic number 119 would be Show Answer

Q736) According to the periodic law of elements, the variation in properties of elements is related to their Show Answer

Q737) Henry Moseley studied characteristic X-ray spectra of elements. The graph which represents his observation correctly is
Given v = frequency of X-ray emitted
Z = atomic number Show Answer

Q738) The characteristics of elements X, Y and Z with atomic numbers respectively 33, 53 and 83 are Show Answer

Q739) Similarity in chemical properties of the atoms of elements in a group of the periodic table is most closely related to Show Answer

Q740) Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electronic configuration of the element, which is just above "E" in the group Show Answer

Q741) If IUPAC name of an element is "unununnium" then the element belongs to nth group of periodic tables. The value of n is . . . . . . . Show Answer

Q742) The atomic number of unnilunium is . . . . . . . . Show Answer

Q743) The IUPAC symbol for the element with atomic number 117 would be Show Answer

Q744) The atomic number of an element having the IUPAC name as unniloctium is Show Answer

Q745) The element having the highest first ionization enthalpy is Show Answer

Q746) The correct order of electronegativity for given elements is Show Answer

Q747) The correct order of metallic character is Show Answer

Q748) The first ionisation enthalpies of Be, B, N and O follow the order Show Answer

Q749) Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.
Assertion (A) The first ionisation enthalpy for is lower than that of nitrogen.
Reason (R) The four electrons in 2p orbitals of oxygen experience more electron-electron repulsion. In the light of the above statements, choose the correct answer from the options given below. Show Answer

Q750) The correct order of first ionisation enthalpy is Show Answer

Q751) The electron gain enthalpy (in kJ/mol) of fluorine, chlorine, bromine and iodine, respectively, are Show Answer

Q752) The element having greatest difference between its first and second ionisation energy, is Show Answer

Q753) The correct order of atomic radius is Show Answer

Q754) The correct option with respect to the Pauling electronegativity values of the elements is Show Answer

Q755) The correct order of electron affinity is Show Answer

Q756) The electronic configuration with the highest ionisation enthalpy is Show Answer

Q757) Which of the following atoms has the highest first ionisation energy? Show Answer

Q758) The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na will be Show Answer

Q759) Which is the correct order of second ionisation potential of C, N, O and F in the following? Show Answer

Q760) The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is Show Answer

Q761) The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is Show Answer

Q762) Which one of the following ions has the highest value of ionic radius? Show Answer

Q763) The correct order of first ionisation enthalpy values of the following elements is:
A. O
B. N
C. Be
D. F
E. B
Choose the most appropriate answer from the options given below. Show Answer

Q764) Given below are two statements:
Statement I Both metals and non-metals exist in p and d-block elements.
Statement II Non-metals have higher ionisation enthalpy and higher electronegativity than the metals.
In the light of the above statements, choose the most appropriate answer from the options given below Show Answer

Q765) Given below are two statements: one is labelled as
Assertion (A) and the other is labelled as Reason (R).
Assertion (A) The first ionisation enthalpy decreases across a period.
Reason (R) The increasing nuclear charge outweighs the shielding across the period.
In the light of the above statements, choose the most appropriate from the options given below Show Answer

Q766) For elements B, C, N, Li, Be, O and F, the correct order of first ionisation enthalpy is Show Answer

Q767) The correct increasing order of the ionic radius is Show Answer

Q768) Inert gases have positive electron gain enthalpy. Its correct order is Show Answer

Q769) In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical?
(A) Rb and Cs
(B) Na and K
(C) Ar and Kr
(D) I and At
Choose the correct answer from the options given below. Show Answer

Q770) Given below are two statements one is labelled as
Assertion (A) and the other is labelled as Reason (R).
Assertion (A) Metallic character decreases and non-metallic character increases on moving from left to right in a period.
Reason (R) It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period.
In the light of the above statements, choose the most appropriate answer from the options given below. Show Answer

Q771) The first ionisation energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respectively, are Show Answer

Q772) Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionisation enthalpy is Show Answer

Q773) Among the statements (I-IV),
(I) Be has smaller atomic radius compared to Mg.
(II) Be has higher ionization enthalpy than Al.
(III) Charge/radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds.
The correct ones are Show Answer

Q774) The third ionisation enthalpy is minimum for: Show Answer

Q775) The process that is not endothermic in nature is Show Answer

Q776) In comparison to boron, beryllium has Show Answer

Q777) The isoelectronic set of ions is Show Answer

Q778) The correct order of the atomic radii of C, Cs, Al and S is Show Answer

Q779) In general, the properties that decrease and increase down a group in the periodic table, respectively are Show Answer

Q780) The group having isoelectronic species is Show Answer

Q781) Within each pair of elements F and Cl, S and Se, and Li and Na, respectively, the elements that release more energy upon an electron gain are Show Answer

Q782) The increasing order of the atomic radii of the following elements is
(A) C
(B) O
(C) F
(D) Cl
(E) Br
Show Answer

Q783) In which of the following arrangements the order is not according to the property indicated against it? Show Answer

Q784) Which of the following option having the correct set of isoelectronic species? Show Answer

Q785) The correct decreasing order of the ionic radii of isoelectronic species are Show Answer

Q786) Which one has the lowest first lonisation enthalpy out of chlorine fluorine, iodine and bromine? Show Answer

Q787) The first ionisation energies of alkaline earth metals are higher than those of the alkali metals. This is because Show Answer

Q788) The correct order of atomic radius is Show Answer

Q789) Among the following basic oxide is Show Answer

Q790) Which pair of oxides is acidic in nature? Show Answer

Q791) The ionic mobility of alkali metal ions in aqueous solution is maximum for Show Answer

Q792) Which of the following oxides is amphoteric in character? Show Answer

Q793) Metals generally melt at very high temperature.
Amongst the following, the metal with the highest melting point will be Show Answer

Q794) The set in which compounds have different nature is Show Answer

Q795) Three elements X, Y and Z are in the 3rd period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic number of X, Y and Z is Show Answer

Q796) Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? Show Answer

Q797) In which of the following arrangements, the is not strictly according to the property written against it? Show Answer

Q798) Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements give the correct picture? Show Answer

Q799) Which of the following oxides is most basic in nature? Show Answer