Practice Test

Q1) Most stable configuration is the configuration of Show Answer

Q2) Atoms combine to form molecules because Show Answer

Q3) According to octet rule, the number of electrons in the valence shell of central atom of the molecule is Show Answer

Q4) Valency expresses Show Answer

Q5) Valence electrons are those present in Show Answer

Q6) Combination of atoms takes place because Show Answer

Q7) Valency of an atom with electronic configuration 2,8,8,1 is Show Answer

Q8) When a molecule is formed by the combination of two atoms Show Answer

Q9) According to octet theory during bond formation Show Answer

Q10) Bond formed between two unlike atom is Show Answer

Q11) Melting and boilling point of ionic compounds are Show Answer

Q12) The type of bond between two atoms depends upon Show Answer

Q13) In the formation of magnesium chloride molecule Show Answer

Q14) The atomic numbers of two elements A and B are X and X+2. If B is an alkali metal, the bonding in A-B is Show Answer

Q15) Electronegativities of atoms give information about Show Answer

Q16) Electropositive atom forms anion by Show Answer

Q17) Electronegative element forms an ion by Show Answer

Q18) Ionic bond involves Show Answer

Q19) Which of the following statement regarding covalent bonding is false? Show Answer

Q20) In a double bond formed between two atoms number of shared electrons are Show Answer

Q21) Bond formed between like atoms is Show Answer

Q22) Convalent bond involves Show Answer

Q23) Bond between Cl-Cl is a Show Answer

Q24) A pure covalent bond is formed with element having Show Answer

Q25) Maximum number of bonds between two atoms of a convalent bond can be Show Answer

Q26) An example for a diatomic molecule having double bonds between its atoms is Show Answer

Q27) Chlorine atoms combine to form chlorine molecule because it Show Answer

Q28) Electron deficient molecules are those, which are formed by Show Answer

Q29) During bond formation normally all the elements in their outermost shell acquire Show Answer

Q30) Bond order is defined as Show Answer

Q31) Bond order is Show Answer

Q32) In a convalent bond,______ the bond length _______ is the energy required to break the bond. Show Answer

Q33) The electronegativity of C, H, O, N and S are 2.5,2.1, 3.5, 3.0, and 2.5 respectively. Which of the following is most polar? Show Answer

Q34) If the average bond dissociation energy of water is 462.75 kJ/mole and the dissociation energy of second O - H bond is 424.7 kJ/mole, the bond dissociation energy of first O - H bond is Show Answer

Q35) Which of the following condition is NOT correct for resonating structures? Show Answer

Q36) What is NOT true about resonance? Show Answer

Q37) Covalent compounds dissolve in Show Answer

Q38) Carbon tetrachloride has NO net dipole moment because of Show Answer

Q39) Electronegativity values of elements help in predicting Show Answer

Q40) A bond is said to be 50% ionic, when the difference in the electronegativity value of the participating atoms is Show Answer

Q41) Which of the following bonds will be the most polar? Show Answer

Q42) A hydrogen-halogen (H-X) bond is polar since Show Answer

Q43) The unit of dipole moment is Show Answer

Q44) Ionic compound dissolve in Show Answer

Q45) When total attractive forces between two atoms is greater than total repulsive forces then P.E of a system Show Answer

Q46) Chlorine molecule is formed by the Show Answer

Q47) In a hydrogen molecule, the attractive and repulsive forces between the atoms are balanced at Show Answer

Q48) An atomic orbital not having a particular direction in space is Show Answer

Q49) H- X bond is formed due to Show Answer

Q50) s-p overlap is defined as the overlapping between Show Answer

Q51) Fluorine molecule is formed by Show Answer

Q52) Hybridization involves Show Answer

Q53) According to valence bond theory, which of the following is a TRUE statement? Show Answer

Q54) Choose the correct statement Show Answer

Q55) In Be, how many electrons are available for bonding, according to VBT? Show Answer

Q56) The weakest bond among the following is Show Answer

Q57) The number of unhybridized orbitals in an acetylene molecule is Show Answer

Q58) The molecule with the shortest distance between the two adjacent carbon atoms is Show Answer

Q59) Number of lone pair of electrons in ethene and borontrifluoride are______ and _______ respectively. Show Answer

Q60) Methane molecule contains ________ lone pairs and _____ bond pairs. Show Answer

Q61) In a homologous series, the percentage of 's' character Show Answer

Q62) The percentage of 'p' character of the hybrid orbitals in methane, ethylene and acetylene are ______ respectively Show Answer

Q63) VBT fails to explain, (i) Directional nature of covalent bond, (ii) Formation of co-ordinate convalent bond, (iii) Paramagnetism of oxygen molecule, (iv) Bonding in electron deficient compound Show Answer

Q64) The concept of bond order in the molecular orbital theory depends on the number of electrons in the bonding and antibonding orbital. The bond order Show Answer

Q65) Which of the following statement is not correct regarding bonding molecular orbitals? Show Answer

Q66) Which of the following theory provides good explanation about the paramagnetic behaviour of oxygen? Show Answer

Q67) Antibonding molecular orbital is formed by Show Answer

Q68) The bond formed in fluorine molecule is Show Answer

Q69) H- bonding is exhibited by Show Answer

Q70) Density of ice is less than that of water because of Show Answer

Q71) Strongest hydrogen bond is shown by Show Answer

Q72) Electronic configuration of an element is 2, 8, 8, 2. Its valency will be Show Answer

Q73) Ionic bonds are formed between Show Answer

Q74) A bond with maximum covalent character in non-metallic elements is found between Show Answer

Q75) A hydrogen molecule is formed between two hydrogen atoms, only when Show Answer

Q76) According to Molecular orbital theory ______. Show Answer

Q77) There is no hydrogen bonding in Show Answer

Q78) Which of the following geometry does NOT correspond to number of bond pairs given in bracket? Show Answer

Q79) The compound with zero dipole moment is Show Answer

Q80) For a stable molecule the value of bond order should be Show Answer

Q81) The electron dot representations of covalent molecules is also
Show Answer

Q82) The charge on a cation M is +2 and on an anion A is -3. The compound formed by them has the formula. Show Answer

Q83) Outermost electronic configuration of four element is given. The one with greatest tendency to form electrovalent bond will be Show Answer

Q84) Which of the following is ionic compound? Show Answer

Q85) Which of the following is a covalent compound? Show Answer

Q86) Which one of the following is an electron deficient compound? Show Answer

Q87) In central atom of which of the following molecules the outermost orbit contains more than 8 electrons? Show Answer

Q88) Which of the following is the electron deficient molecule? Show Answer

Q89) Which of the following have odd number of electrons? Show Answer

Q90) Resonance structure can be written for Show Answer

Q91) Which of the following molecule is non polar? Show Answer

Q92) LiI is more covalent than LiCl due to presence of Show Answer

Q93) The p-p orbital overlap is present in Show Answer

Q94) Which of the following statement is WRONG? Show Answer

Q95) A hybrid orbital formed from s and p-orbital can contribute to Show Answer

Q96) Square planar molecules undergo_______ hybridization Show Answer

Q97) Which of the following molecule is T-shaped? Show Answer

Q98) A sigma bond is formed by overlapping of Show Answer

Q99) Which of the following molecule has a linear shape? Show Answer

Q100) Which of the following molecules does not contain a lone pair of electrons? Show Answer

Q101) Which carbon is most electronegative? Show Answer

Q102) Formaldehyde molecule contains Show Answer

Q103) Which of the following molecule possesses pyramidal structure? Show Answer

Q104) In the excited state an electron from 2s orbital of beryllium jumps to Show Answer

Q105) Formation of an excited state will NOT be observed in the hybridization for the for formation of Show Answer

Q106) Which of the following molecule has two p-orbitals unused? Show Answer

Q107) Molecule having one lone pair of electron is Show Answer

Q108) The increasing order of bond angles in the molecules of water, ammonia, methane and carbon dioxide is Show Answer

Q109) In which of the following is the angle between the two covalent bonds greatest? Show Answer

Q110) On hybridization of one s and one p orbital we get, Show Answer

Q111) Which of the following cannot exist on the basis of MO theory? Show Answer

Q112) The oxygen molecule contains Show Answer

Q113) A diatomic molecule is not formed for Show Answer

Q114) Which of the following molecules has one lone pair of electrons on the central atom? Show Answer

Q115) Which of the following molecule has net dipole moment? Show Answer

Q116) The carbon monoxide molecule may be represented by the following structures except Show Answer

Q117) Which of the following is the electronic configuration of nitrogen atom in the excited state? Show Answer

Q118) In a double bond connecting two atoms there is a sharing of Show Answer

Q119) Pi bond is formed by the overlapping of Show Answer

Q120) Which of the following bonds is the most ionic ? Show Answer

Q121) Which of the following contains both covalent and ionic bonds ? Show Answer

Q122) In which of the compounds, there is an electrovalent linkage ? Show Answer

Q123) Sulphuric acid molecule contains Show Answer

Q124) Which of the following contains a coordinate covalent bond ? Show Answer

Q125) Hydrogen chloride molecule contains Show Answer

Q126) How many sigma and pi bonds are present in tetracyanoethylene ? Show Answer

Q127) Which of the following substance has the least ionic character ? Show Answer

Q128) Which chloride should exhibit the most covalent type of bond ? Show Answer

Q129) Carbon dioxide is isostructural with which of the following ? Show Answer

Q130) The correct order of decreasing polarisability of the ion is Show Answer

Q131) Which of the following statement is not correct, for sigma pi-bonds formed between two carbon atoms ? Show Answer

Q132) How many sigma and pi - bonds are present in toluene ? Show Answer

Q133) Sulphuric acid provides a simple example of Show Answer

Q134) The correct order of the lattice energies of the following ionic compounds is Show Answer

Q135) Which of the following does not contain coordinate bond ? Show Answer

Q136) Which of the following is least ionic ? Show Answer

Q137) A bond with maximum covalent character between non-metallic element is found Show Answer

Q138) Covalent compounds are soluble in Show Answer

Q139) The bond between two identical non metal atoms has a pair of electrons Show Answer

Q140) In covalent bond Show Answer

Q141) Which of the following factors do not have favour electrovalency ? Show Answer

Q142) Among all alkaline earth metals the element forming predominantly covalent compound is Show Answer

Q143) Fluorine molecule is formed by Show Answer

Q144) Which of the following has covalent as well as ionic valency ? Show Answer

Q145) Which of the following is least ionic ? Show Answer

Q146) According to Fajan's rule, covalent bond is favoured by Show Answer

Q147) The electronegativities of F, Cl, Br and I are 4, 0, 3, 0, 2, 8, 2, 5 respectively. Hydrogen halide with a high percentage of ionic character is Show Answer

Q148) Outermost shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be Show Answer

Q149) Which of the following is electron deficient ? Show Answer

Q150) Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding ? Show Answer

Q151) In which of the following molecules is the covalent bond most polar ? Show Answer

Q152) Covalent compounds have low melting points because Show Answer

Q153) Chemical bond implies Show Answer

Q154) A lone pair of electrons in an atom implies Show Answer

Q155) Sodium chloride is an ionic compound whereas hydrogen chloride is mainly covalent because Show Answer

Q156) The number and types of bonds between carbon atoms in calcium carbide are Show Answer

Q157) Of the following sets which does not contain isoelectronic species ? Show Answer

Q158) Which of the following is electron deficient molecule ? Show Answer

Q159) Correct sequence of increasing covalent character is represented by Show Answer

Q160) The compound which contains both ionic and covalent bonds is Show Answer

Q161) Element X is strongly electropositive and element Y is strongly electronegative. Both are univalent.The compound formed would be Show Answer

Q162) Which of the following compounds is covalent ? Show Answer

Q163) Which ion is isoelectronic with CO ? Show Answer

Q164) The enolic form of acetone has Show Answer

Q165) Which is most ionic ? Show Answer

Q166) Which of the following statements is not correct ? Show Answer

Q167) In which of the following the angle between the two covalent bonds is largest ? Show Answer

Q168) Which has the minimum bond angle ? Show Answer

Q169) The pyramidal geometry is associated with Show Answer

Q170) Which one of the following has tetrahedral disposition ? Show Answer

Q171) A molecular is square planar with no lone pair. What type of hybridisation is associated with it ? Show Answer

Q172) Which of the following molecules is linear ? Show Answer

Q173) The octahedral shape is associated with Show Answer

Q174) The hybrid state of carbon is diamond, graphite and acetylene are respectively. Show Answer

Q175) Which overlap is involved in HCl molecule ? Show Answer

Q176) Which of the following molecule / ions has triangular pyramidal shape ? Show Answer

Q177) Which of the following pairs contains iso - structural species ? Show Answer

Q178) Directed bond in water forms an angle of nearly Show Answer

Q179) The angles between covalent bonds is maximum in Show Answer

Q180) One of the following is having square planar structure Show Answer

Q181) According to VSEPR theory, the shape of the water molecule is Show Answer

Q182) Which of the following is planar ? Show Answer

Q183) which of the following will be octahedral ? Show Answer

Q184) Carbon atoms in benzene molecule are inclined at an angle of Show Answer

Q185) Polarisation of electrons in acrolein may be written as Show Answer

Q186) Which one of the following molecules will have unequal bond lengths ? Show Answer

Q187) Most efficient overlaping is Show Answer

Q188) Slidewise overlap of p - p orbitals forms Show Answer

Q189) Which of the following bonds requires the largest amount of bond energy to disassociated the atoms concerned ? Show Answer

Q190) Berylium atom in berylium fluoride is Show Answer

Q191) Which of the following has unchanged valency ? Show Answer

Q192) The ion which is not tetrahedral in shape is Show Answer

Q193) Which of the following is correct ? Show Answer

Q194) Which one of the following has the smallest bond angle ? Show Answer

Q195) Which of the following compounds possesses C - H bond with the lowest bond dissociation energy ? Show Answer

Q196) Which carbon is more electronegative ? Show Answer

Q197) In which of the following molecules the central atom does not follow the octet rule ? Show Answer

Q198) Which one of the following molecule has the smallest bond angle ? Show Answer

Q199) The ONO angle is maximum in Show Answer

Q200) On hybridisation of one s and p orbital we get Show Answer

Q201) Which of the following is a linear molecule ? Show Answer

Q202) Which of the following bonds is most polar ? Show Answer

Q203) Which one of the following statement is true ? Show Answer

Q204) Which of the following has zero dipole moment ? Show Answer

Q205) Which of the following is polar ? Show Answer

Q206) Which of the following molecules does not have dipole moment ? Show Answer

Q207) Which of the following compound(s) is non-polar ? Show Answer

Q208) Among the following compounds, which has a dipole moment ? Show Answer

Q209) The dipole moment is the highest for Show Answer

Q210) The linear combination of two hybridised orbitals each having one electron and belonging to two different atoms leads to a Show Answer

Q211) Which pair among the following is isostructural ? Show Answer

Q212) In acetylene molecule, the two carbon atoms are linked by Show Answer

Q213) A square planar complex is formed by hybridisation of which atomic orbitals ? Show Answer

Q214) Which of the following arrangement of molecules is correct on the basis of their dipole moments ? Show Answer

Q215) The correct sequence of decrease in the bond angles of the following hybrides is Show Answer

Q216) Which one of the following has the regular tetrahedral structure ?
(Atomic no. : B = 5, S = 16, Ni = 28, Xe = 54) Show Answer

Q217) Lattice energy of an ionic compound depends upon Show Answer

Q218) Which of the following would have a permanent dipole moment ? Show Answer

Q219) The correct order in which O - O bond length increases in the following is Show Answer

Q220) The octet rule is not valid for the molecule Show Answer

Q221) Amongst the following molecules the one with the largest distance between the two adjacent carbon atoms is Show Answer

Q222) Which of the following compounds has a linear structure ? Show Answer

Q223) Dipole moment is shown by Show Answer

Q224) Which one of the following halogens has the highest bond energy ? Show Answer

Q225) Amongst the following the molecule that is linear is Show Answer

Q226) The species which has pyramidal shape is Show Answer

Q227) The molecular which has zero dipole moment is Show Answer

Q228) Which contains both polar and non polar bonds ? Show Answer

Q229) Which of the following, hydrocarbons has the lowest dipole moment ? Show Answer

Q230) Among the following, the molecule with the highest dipole moment is Show Answer

Q231) The compound which has maximum number of lone pairs of electrons on central atom is Show Answer

Q232) Which of the following compounds can form hydrogen bond ? Show Answer

Q233) Which of the following does not apply to bonding in metals ? Show Answer

Q234) Which one of these is weakest ? Show Answer

Q235) The high density of water compared to ice is due to Show Answer

Q236) Which is most viscous ? Show Answer

Q237) Which one of the following molecules will form a linear polymeric structure due to hydrogen bonding ? Show Answer

Q238) The boiling of para-nitrophenol is greater than that of ortho - nitrophenol, because Show Answer

Q239) The boiling point of methanol is greater than methyl thiol because Show Answer

Q240) H - bonding is not present in Show Answer

Q241) Intermolecular forces in solid hydrogen are Show Answer

Q242) The luster of the metal is on account of Show Answer

Q243) The nature of inter - particle forces in benzene is Show Answer

Q244) When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together ? Show Answer

Q245) The maximum extent of H - bonding is shown by Show Answer

Q246) Which of the following does not conduct electricity ? Show Answer

Q247) The number of electrons that are paired in oxygen molecule is Show Answer

Q248) The boiling point of heavy water is Show Answer

Q249) Methanol and ethanol are miscible in water due to Show Answer

Q250) The bond order of a molecule is given by Show Answer

Q251) The bond angle H -O - H in ice is closest to Show Answer

Q252) In a homonuclear molecule which of the following set of orbitals are degenerate ? Show Answer

Q253) Other factors being constant which bond order is expected to correspond to shortest bond length ? Show Answer

Q254) Which of the following is non - existent according to molecular orbital theory ? Show Answer

Q255) The molecular species having highest bond order is Show Answer

Q256) Which of the following is not paramagnetic ? Show Answer

Q257) An ionic solid is a poor conductor of electricity because Show Answer

Q258) Paramagnetism is exhibited by molecules which Show Answer

Q259) Which of the following species is paramagnetic ? Show Answer

Q260) Which one among the following is not paramagnetic ?
( At. no. Be =4 ; Ne = 10 ; Cl =17 ; As = 33) Show Answer

Q261) What is the correct sequence of bond order ? Show Answer

Q262) The molecule having bond order 3 is Show Answer

Q263) Which of the following is not paramagnetic ? Show Answer

Q264) Which of the following is paramagnetic ? Show Answer

Q265) Which of the following hydrides has the lowest boiling point ? Show Answer

Q266) Antibonding MO formed by Show Answer

Q267) Which one of the following species is diamagnetic in nature ? Show Answer

Q268) Which of the following is soluble in water ? Show Answer

Q269) Oxygen molecule is paramagnetic because Show Answer

Q270) The molecule having one unpaired electron is Show Answer

Q271) Hydrogen bonding is maximum in Show Answer

Q272) Which of the following species is paramagnetic ? Show Answer

Q273) Combination of two AOs leads to the formation of Show Answer

Q274) The maximum possible number of hydrogen bonds in which a water molecule can participate is Show Answer

Q275) Which of the following molecular species has unpaired electron(s) ? Show Answer

Q276) Which of the following is not paramagnetic. Show Answer

Q277) The pair of molecules forming strongest intermolecular hydrogen bonding are Show Answer

Q278) Which of the following is not linear ? Show Answer

Q279) Which of the following compounds, shows ionic, covalent and coordinate bonds ? Show Answer

Q280) Which of the following is non - polar ? Show Answer

Q281) Which of the following has no dipole moment ? Show Answer

Q282) Which one of the following is highest melting halide ? Show Answer

Q283) Which of the following is non - linear molecule ? Show Answer

Q284) The polarising ability of which one of the following is highest ? Show Answer

Q285) Which of the following molecules has pyramidal shape ? Show Answer

Q286) Which of the following has covalent bond ? Show Answer

Q287) Increasing order of electronegativity of the hybrid orbitals is Show Answer

Q288) Among the following, shortest bond length is in Show Answer

Q289) Metallic luster is explained by Show Answer

Q290) Which of the following represents isostructural pairs ? Show Answer

Q291) Among the following, the pair in which the two species are not isostructural is Show Answer

Q292) Which of the following molecules / ions does not contain unpaired electrons ? Show Answer

Q293) Among the following mixtures, dipole - dipole as the major interaction, are present in Show Answer

Q294) In which of the following molecules / ions are all the bonds not equal ? Show Answer

Q295) Which of the following species exhibits the diamagnetic behaviour ? Show Answer

Q296) In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed ? Show Answer

Q297) Which of the following hydrogen bonds is the strongest ? Show Answer

Q298) Which one of the following constitutes a group of the isoelectronic species ? Show Answer

Q299) Using MO theory predict which of the following species has the shortest bond length ? Show Answer

Q300) (I) 1,2 - dihydroxy benzene
(II) 1,3 - dihydroxy benzene
(III) 1,4 - dihydroxy benzene
(IV) Hydroxy benzene.
The increasing order of boiling points of above mentioned alcohols is Show Answer

Q301) Statement 1: Oxygen does not possess d- orbitals in their valency shell
Statement 2: The covalency of oxygen is two
Show Answer

Q302) Statement 1: NaCl is more ionic than NaI.
Statement 2: Chlorine is more electronegative than iodine.
Show Answer

Q303) Statement 1: Bond energy has order likeC-C<=C Statement 2: Bond energy increases with increase in bond order
Show Answer

Q304) Statement 1: LiCl is predominantly a covalent compound.
Statement 2: Electronegativity difference between Li and Cl is too small.
Show Answer

Q305) Statement 1: Ionisation enthalpy is always positive.
Statement 2: Energy is always required when electrons are removed.
Show Answer

Q306) Statement 1: Alkanes are insoluble in water
Statement 2: Organic compounds do not form hydrogen bonding with water
Show Answer

Q307) Statement 1: F-F bond has low bond dissociation energy
Statement 2: The fluorine has low reactivity
Show Answer

Q308) Van der Waals’ forces between molecules depend upon: Show Answer

Q309) An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number is: Show Answer

Q310) Which has the largest distance between the carbon hydrogen atom? Show Answer

Q311) Length of hydrogen bond ranges from 2.5Ã… to: Show Answer

Q312) Which molecule is planar? Show Answer

Q313) Two ice cubes are pressed over each other until they unite to form one block. Which one of the following forces dominates for holding them together? Show Answer

Q314) Maximum number of covalent bonds between two like atoms can be: Show Answer

Q315) When sodium and chlorine react, energy is: Show Answer

Q316) The element having lowest ionisation energy among the following is: Show Answer

Q317) Two type FXF angles are present in which of the following molecules? (X=S, Xe, C) Show Answer

Q318) Which is electron deficient compound? Show Answer

Q319) Which of the following is not correct regarding the properties of ionic compounds? Show Answer

Q320) Which of the following is not tetrahedral? Show Answer

Q321) Linear combination of two hybridized orbitals, belonging to two atoms and each having one electron leads to: Show Answer

Q322) In allene structure, three carbon atoms are joined by: Show Answer

Q323) The carbon atom in graphite is: Show Answer

Q324) Boron cannot form which one of the following anions? Show Answer

Q325) If Z-axis is the molecular axis, then π-molecular orbitals are formed by the overlap of Show Answer

Q326) Which one is the weakest bond? Show Answer

Q327) According to MO theory, which of the following lists ranks the nitrogen species in terms of increasing bond order? Show Answer

Q328) The equilateral triangle shape has: Show Answer

Q329) Which of the following has fractional bond order? Show Answer

Q330) For which of the following hybridization the bond angle is maximum? Show Answer

Q331) Stability of hydrides generally increases with: Show Answer

Q332) Which can be described as a molecule with residual bonding capacity? Show Answer

Q333) Among the following elements, the most electronegative is: Show Answer

Q334) Metallic bonds do not play a role in: Show Answer

Q335) Which p-orbitals overlapping would give the strongest bond? Show Answer

Q336) When two atomic orbitals combine, they form: Show Answer

Q337) The correct increasing covalent nature is: Show Answer

Q338) Greater the dipole moment: Show Answer

Q339) Which of the following molecular orbitals has two nodal planes? Show Answer

Q340) Hydrogen bonding is maximum in Show Answer

Q341) The O—H bond distance in water molecule is: Show Answer

Q342) Which among the following molecules/ ions is diamagnetic? Show Answer

Q343) The enolic form of acetone contains Show Answer

Q344) Which of the following is paramagnetic with bond order 0.5? Show Answer

Q345) Water has high heat of vaporization due to: Show Answer

Q346) The C – H bond distance is the longest in Show Answer

Q347) 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

Q348) Polar covalent compounds are soluble in: Show Answer

Q349) Which does not show hydrogen bonding? Show Answer

Q350) Which among the following has highest ionic radius? Show Answer

Q351) Zero dipole moment is possessed by Show Answer

Q352) Which one of the following orders is not in according with the property stated against it? Show Answer

Q353) The incorrect statements regarding bonding molecular orbitals because: Show Answer

Q354) A coordinate bond is a dative covalent bond. Which of the below is true? Show Answer

Q355) The electronegativity values of C, H, O, N and S are 2.5, 2.1, 3.5, 3.0 and 2.5 respectively. Which of the following bonds is most polar? Show Answer

Q356) Which of the following has largest size? Show Answer

Q357) In which of the following, the bond length between hybridised carbon atom and other carbon atom is minimum? Show Answer

Q358) Which is expected to conduct electricity? Show Answer

Q359) Metals are good conductors of electricity because they contain Show Answer

Q360) The species having pyramidal shape is Show Answer

Q361) The attraction that non-polar molecules have for each other is primarily caused by: Show Answer

Q362) In HCHO carbon atom has hybridisation: Show Answer

Q363) Which of the following species has four lone pairs of electrons in its outer shell? Show Answer

Q364) Chlorine atom, in its third excited state, reacts with fluorine to form a compound X. The formula and shape of X are Show Answer

Q365) In which of the following molecules are all the bonds not equal? Show Answer

Q366) Which of the following compound is covalent? Show Answer

Q367) Which of the following molecular species has unpaired electron (s)? Show Answer

Q368) The correct order of bond angles is: Show Answer

Q369) If the bond length and dipole moment of a diatomic molecule are 1.25 A and 1.0 D respectively, what is the per cent ionic character of the bond? Show Answer

Q370) The molecule which does not exhibit dipole moment is Show Answer

Q371) The correct order of radii is: Show Answer

Q372) The bond order is maximum in: Show Answer

Q373) Which of the following atoms has minimum covalent radius? Show Answer

Q374) The screening effect of d-electrons is: Show Answer

Q375) Which of the following statement is wrong? Show Answer

Q376) The molecule having permanent dipole moment is: Show Answer

Q377) Unusually high boiling point of water is result of Show Answer

Q378) Which of the following is least ionic? Show Answer

Q379) A compound contains X, Y and Z atoms. The oxidation states of X, Y and Z are +2, +2 and -2 respectively. The possible formula of the compound is Show Answer

Q380) Which one of the following is a non-polar molecule? Show Answer

Q381) Which one of the following has the regular tetrahedral structure?
(Atomic numbers B = 5, S = 16, Ni = 28, Xe = 54)
Show Answer

Q382) If the dipole moment of toluene and nitro-benzene are 0.43 D and 3.93 D, then what is the expected dipole moment of p-nitro toluene? Show Answer

Q383) Which of the following is most stable? Show Answer

Q384) Which one of the following pairs of species has the same bond order: Show Answer

Q385) Which of the following characteristics regarding halogens is not correct? Show Answer

Q386) The number of S – S bonds in sulphur trioxide is Show Answer

Q387) The low density of ice compared to water is due to Show Answer

Q388) Which of the following compounds has dipole moment approximately equal to that of chlorobenzene? Show Answer

Q389) Which of the following overlaps leads to bonding? Show Answer

Q390) Which of the following is correct? Show Answer

Q391) The number of sigma and pi bonds in peroxodisulphuric acid are respectively Show Answer

Q392) Which is not a paramagnetic species? Show Answer

Q393) Electron deficient species are known as: Show Answer

Q394) The molecule having three folds of axis of symmetry is: Show Answer

Q395) Among the following the molecule with the highest dipole moment is Show Answer

Q396) A molecule which cannot exist theoretically is: Show Answer

Q397) An atom X has three valence electrons and atom Y has six valence electrons. The compound formed between them will have the formula Show Answer

Q398) Which one is polar molecule among the following? Show Answer

Q399) Shape of molecules is decided by: Show Answer

Q400) The shape of carbon dioxide is Show Answer

Q401) The correct ionic radii order is: Show Answer

Q402) Which is not linear? Show Answer

Q403) Hybridisation of oxygen in diethyl ether is Show Answer

Q404) What is the effect of more electronegative atom on the strength of ionic bond? Show Answer

Q405) Which of the following two are isostructural? Show Answer

Q406) Which molecule is linear? Show Answer

Q407) Which of the following shows minimum melting point? Show Answer

Q408) Which of the following does not have a lone pair on the central atom? Show Answer

Q409) Molecular orbital theory was given by Show Answer

Q410) Proton plays an important role in…bonding. Show Answer

Q411) Which represents a collection of isoelectronic species? Show Answer

Q412) An electrovalent compound does not exhibit space isomerism due to: Show Answer

Q413) 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

Q414) C-Cl bond is stronger than C –I bond, because Show Answer

Q415) The ICl molecule is: Show Answer

Q416) Which of the following silver salts is insoluble in water? Show Answer

Q417) Silicon has 4 electrons in the outermost orbit. In forming the bond: Show Answer

Q418) Chlorine atom tends to acquire the structure of: Show Answer

Q419) Intramolecular hydrogen bond is present in Show Answer

Q420) According to VSEPR theory the repulsion between different pair (lone or bond) of electrons obey the order Show Answer

Q421) The bond between two identical non-metal atoms has a pair of electrons: Show Answer

Q422) The correct order of increasing electropositive character among Cu,Fe and Mg is: Show Answer

Q423) The electron affinity for inert gases is likely to be: Show Answer

Q424) 1,3-butadiene has: Show Answer

Q425) The bond between atoms of two elements of atomic number 37 and 53 is: Show Answer

Q426) In methane the bond angle is Show Answer

Q427) One would expect the elemental form of Cs at room temperature to be: Show Answer

Q428) Which of the following is false? Show Answer

Q429) Ionic radii are: Show Answer

Q430) Which of the following statements is incorrect? Show Answer

Q431) Which of the following pairs will from the most stable ionic bond? Show Answer

Q432) Among NaF,NaCl NaBr and NaI, the NaF has highest melting point because: Show Answer

Q433) Which of the following has regular tetrahedral shape? Show Answer

Q434) Which of the following will have large dipole moment? Show Answer

Q435) In which of the following pairs the two species are not isostructural? Show Answer

Q436) The molecule having a pyramidal shape out of the following is Show Answer

Q437) An atom of an element A has three electrons in its outermost orbit and that of B has six electrons in its outermost orbit. The formula of the compound between these two will be Show Answer

Q438) The bond angle in ammonia molecule is Show Answer

Q439) Which statement is wrong? Show Answer

Q440) Which of the following molecules has three fold axis of symmetry? Show Answer

Q441) Oxygen and the oxide ion have the Show Answer

Q442) Valence bond theory of metallic bond was given by Show Answer

Q443) The correct order of second ionisation potential of carbon, nitrogen, oxygen and fluorine is: Show Answer

Q444) The molecule which has T – shaped structure is Show Answer

Q445) As a result of resonance: Show Answer

Q446) The pair of species with the same bond order is: Show Answer

Q447) Which of the following molecules has pentagonal bipyramidal shape? Show Answer

Q448) The number of types of bonds between two carbon atoms in calcium carbide is Show Answer

Q449) The bond angle between H—O—H in ice is closest to: Show Answer

Q450) Which combination of atoms can form a polar covalent bond? Show Answer

Q451) H-bonding is not present in: Show Answer

Q452) In which of the following gaseous molecules, the ionic character of the covalent bond is greatest? Show Answer

Q453) The angle between the overlapping of one s-orbital and one p-orbital is: Show Answer

Q454) Which is expected to have linear structure? Show Answer

Q455) Carnallite in solution in water shows the properties of Show Answer

Q456) A simple of a coordinate covalent bond is exhibited by Show Answer

Q457) In the series ethane, ethylene and acetylene, the C—H bond energy is: Show Answer

Q458) In which molecule the van der Waals’ force is likely to be the most important in determining the m.p. and b.p.? Show Answer

Q459) Identify the wrong statement in the following: Show Answer

Q460) (I)1, 2-dihydroxy benzene
(II) 1, 3-dihydroxy benzene
(III) 1, 4-dihydroxy benzene
(IV) Hydroxy benzene
The increasing order of boiling points of above mentioned alcohols is
Show Answer

Q461) Dipole moment is shown by Show Answer

Q462) In which molecular are all atoms coplanar? Show Answer

Q463) The compound with the maximum dipole moment among the following is: Show Answer

Q464) Which of the following bonds require the largest amount of energy to dissociate the bond concerned? Show Answer

Q465) The sequence that correctly describes the relative bond strength pertaining to oxygen molecule and its cation or anion is Show Answer

Q466) Which have zero dipole moment? Show Answer

Q467) Strongest bond is formed by the head on overlapping of: Show Answer

Q468) Arrange the following compound in order of increasing dipole moment:
Toluene (I) m-dichlorobenzene (II)
o-dichlorobenzene (III) p-dichlorobenzene (IV)
Show Answer

Q469) Which has maximum covalent character? Show Answer

Q470) Which species does not exist? Show Answer

Q471) Among the following which has the highest cation to anion size ratio? Show Answer

Q472) When an element of very low ionisation potential is allowed to react with an element of very high electron affinity, we get: Show Answer

Q473) Ionization potential is lowest for: Show Answer

Q474) The orbitals of same energy level providing the most efficient overlapping are: Show Answer

Q475) The covalent compound HCl has the polar character because: Show Answer

Q476) The increasing order of the ionic radii of the given isoelectronic species is: Show Answer

Q477) Which cannot exist on the basis of M.O. theory? Show Answer

Q478) Which of the following does not involve covalent bond? Show Answer

Q479) The electronegativity of A and B are 1.20 and 4.0 respectively. Therefore, ionic character in A-B bond will be Show Answer

Q480) During the formation of a chemical bond Show Answer

Q481) Pair of species having identical shapes for molecules is Show Answer

Q482) An example of a polar covalent compound is Show Answer

Q483) Which is not an exception to octet rule? Show Answer

Q484) The molecules having dipole moment are: Show Answer

Q485) Which of the following species has a bond order other than 3? Show Answer

Q486) Which of the following is planar? Show Answer

Q487) The bond angle and dipole moment of water respectively, are Show Answer

Q488) The correct order of increasing bond angles in the following species is: Show Answer

Q489) Which compound shows hydrogen bonding? Show Answer

Q490) Chlorine atom differs from chloride ion in the number of: Show Answer

Q491) What is the reason for unusual high b.p. of water? Show Answer

Q492) The increasing order of the first ionization enthalpies of the elements B, P, S and F (lower first) is: Show Answer

Q493) Which of the following is paramagnetic? Show Answer

Q494) Ionization potential of Na would be numerically the same as: Show Answer

Q495) Which one of the following conversions involve change in both hybridisation and shape? Show Answer

Q496) According to MO theory, Show Answer

Q497) The order of first electron affinity of O,S and Se is: Show Answer

Q498) The correct electronegativity order is: Show Answer

Q499) The pair of species having identical shapes for molecules of both species is Show Answer

Q500) Amongst the following, the molecule that is linear is Show Answer

Q501) Using MO theory predict which of the following species has the shortest bond length? Show Answer

Q502) The hybridisation of carbon atom in benzene is? Show Answer

Q503) Iron is tougher than sodium because: Show Answer

Q504) A bond with maximum covalent character between non-metallic elements is formed: Show Answer

Q505) When ionic compounds get dissolved in water: Show Answer

Q506) Pick the odd one out (The one having zero dipole moment): Show Answer

Q507) Which of the following shows minimum bond angle? Show Answer

Q508) Among the following isostructural compounds, identify the compound which has the highest lattice energy Show Answer

Q509) Which species is diamagnetic in nature? Show Answer

Q510) Which of the following compounds would have the highest boiling point? Show Answer

Q511) Which of the compounds has highest boiling point? Show Answer

Q512) Which has the highest bond energy? Show Answer

Q513) The incorrect statement among the following is: Show Answer

Q514) The bond angle is smallest in Show Answer

Q515) Acetic acid exists as dimer in benzene due to: Show Answer

Q516) Chemical bond formation takes place when? Show Answer

Q517) Which of the following has a bond order of 1.75? Show Answer

Q518) Higher is the bond order, greater is: Show Answer

Q519) Which has the highest ionisation potential? Show Answer

Q520) Strongest bond is in: Show Answer

Q521) Which of the following is not correct with respect to bond length of the species? Show Answer

Q522) Which is likely to have the highest melting point? Show Answer

Q523) Which of the following are not correct? Show Answer

Q524) The half of the difference between the number of electrons in bonding molecular orbitals and antibonding molecular orbitals is known as: Show Answer

Q525) Which of the following set contains species having same angle around the central atom? Show Answer

Q526) 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

Q527) Which of the following has lowest bond angle? Show Answer

Q528) Which of the following has shortest carbon-carbon bond length? Show Answer

Q529) Which one of the following constitutes a group of the isoelectronic species? Show Answer

Q530) Methanol and ethanol are miscible in water due to: Show Answer

Q531) Which has the lowest anion to cation size ratio? Show Answer

Q532) Which of the following has covalent bond? Show Answer

Q533) The correct order in which the O-O bond length increases in the following is Show Answer

Q534) As compared to covalent compounds, electrovalent compounds generally have: Show Answer

Q535) Which is present in peroxides? Show Answer

Q536) Which molecule is T-shaped? Show Answer

Q537) Which of the following is paramagnetic? Show Answer

Q538) Dipole moment is highest for: Show Answer

Q539) Which will not conduct electricity? Show Answer

Q540) The ionization potential order for which set is correct? Show Answer

Q541) The bond that determines the secondary structure of a protein is: Show Answer

Q542) Molecular orbital theory was developed mainly by Show Answer

Q543) Which species has lone pair on central atom? Show Answer

Q544) In which of the following molecules/ions are all the bonds not equal? Show Answer

Q545) Super octet molecule is: Show Answer

Q546) The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is: Show Answer

Q547) Which of the following statement is not correct? Show Answer

Q548) Which statement is correct? Show Answer

Q549) Which of the following pair has same structure? Show Answer

Q550) Which of the following has dipole moment? Show Answer

Q551) Which one of the following is highest melting halide? Show Answer

Q552) The correct order of increasing bond angles in the following triatomic species is: Show Answer

Q553) As the s-character of hybridization orbitals increases, the bond angle: Show Answer

Q554) Which one of the following is a correct set with respect to molecule, hybridisation and shape? Show Answer

Q555) The correct order of decreasing polarity is Show Answer

Q556) The process requiring the absorption of energy is: Show Answer

Q557) Among the following metals interatomic forces are probably weakest in: Show Answer

Q558) 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

Q559) If the bond has zero per cent ionic character, the bond is: Show Answer

Q560) The species having bond order different from that in CO is Show Answer

Q561) The species having octahedral shape is: Show Answer

Q562) Which of the following will show least dipole moment? Show Answer

Q563) Which has the minimum bond energy? Show Answer

Q564) The polarising ability of which one of the following is highest? Show Answer

Q565) Which is expected to show paramagnetism? Show Answer

Q566) Highest covalent character is found in which of the following? Show Answer

Q567) The molecule which has zero moment is Show Answer

Q568) Hydrogen bond is strongest in Show Answer

Q569) The only molecule having dipole moment is Show Answer

Q570) Two lone pairs of electrons and two bond pairs are present in: Show Answer

Q571) The increase in bond order results in: Show Answer

Q572) Which is not characteristic of π-bond? Show Answer

Q573) Which species has the highest bond order? Show Answer

Q574) The correct sequence of hybridisation of methane, ethene and acetylene is Show Answer

Q575) The nature of the bond in diamond is Show Answer

Q576) The set representing the correct order of first ionization potential is: Show Answer

Q577) Amongst the following, the molecule that is linear is Show Answer

Q578) Which of the following species does not exist under normal conditions? Show Answer

Q579) Octet rule is not valid for the molecule: Show Answer

Q580) 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

Q581) The Cl—C—Cl angle in 1, 1, 2, 2-tetrachloroethene and tetrachloromethane respectively will be about: Show Answer

Q582) Which set has strongest tendency to form anions? Show Answer

Q583) In a crystal, the atoms are located at the positions of: Show Answer

Q584) Which substance has the greatest ionic character? Show Answer

Q585) The conductivity of the metal decreases with increases in temperature because Show Answer

Q586) Which of the following when dissolved in water forms a solution, i.e., non-conducting? Show Answer

Q587) Which bond is more polar? Show Answer

Q588) The pairs of bases in DNA are held together by: Show Answer

Q589) Which of the following has highest bond angle? Show Answer

Q590) 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

Q591) The hydrogen bonding is strongest in: Show Answer

Q592) The correct increasing order of polarising power is: Show Answer

Q593) Acetate ion contains: Show Answer

Q594) Which one is paramagnetic and has the bond order half (0.5)? Show Answer

Q595) Which one is correct? Show Answer

Q596) IP is influenced by: Show Answer

Q597) Which of the following has lowest boiling point? Show Answer

Q598) When metals react with non-metals, the metal atoms tend to Show Answer

Q599) Which one has more tendency to form covalent compounds? Show Answer

Q600) The order of melting point of ortho, para, meta-nitrophenol is Show Answer

Q601) The hybridization of carbon in diamond, graphite and acetylene is: Show Answer

Q602) The molecule, ion which is pyramidal in shape is Show Answer

Q603) C-C bond order in benzene is Show Answer

Q604) For the formation of covalent bond, the difference in the value of electronegativities should be: Show Answer

Q605) Which among the following elements has lowest value of ionisation energy? Show Answer

Q606) In coordinate bond, the acceptor atoms must essentially contain in its valency shell an orbitals: Show Answer

Q607) Paramagnetism of oxygen is explained on the basis of its electronic configuration of Show Answer

Q608) The compound possessing most strongly ionic nature is: Show Answer

Q609) The complex ion which has no ‘d’ electrons in the central metal atom is: Show Answer

Q610) Which of the following species is least stable? Show Answer

Q611) Which group of atoms have nearly same atomic radius? Show Answer

Q612) Bond polarity of diatomic molecule is because of Show Answer

Q613) Which contains a coordinate and covalent bond? Show Answer

Q614) Covalent radius of Li is 123 pm. The crystal radius of Li will be: Show Answer

Q615) Which of the following does not contain coordinate bond? Show Answer

Q616) With increasing bond order, stability of a bond Show Answer

Q617) Molecular orbitals theory was proposed by: Show Answer

Q618) The isoelectronic pair is Show Answer

Q619) The compound 1,2-butadiene has Show Answer

Q620) The correct order of ionic radii is: Show Answer

Q621) The shape of sulphate ion is Show Answer

Q622) Sodium chloride is soluble in water but not in benzene because Show Answer

Q623) The pair likely to form the strongest hydrogen bonding: Show Answer

Q624) The number of sigma and pi bonds in 1- butane 3-yne are: Show Answer

Q625) Which is soluble in water? Show Answer

Q626) Which of the following compounds has the lowest melting point? Show Answer

Q627) Which of the following is false? Show Answer

Q628) The pair of elements which on combination are most likely to form an ionic compound is: Show Answer

Q629) Among the following the maximum covalent character is shown by the compound. Show Answer

Q630) Dipole-dipole attractive forces are strongest between the molecules of: Show Answer

Q631) The electrons used in bonding atoms: Show Answer

Q632) In a homonuclear molecule which of the following set of orbitals is degenerate? Show Answer

Q633) The electronegativity order of O, F, Cl and Br is: Show Answer

Q634) Solid NaCl is a bad conductor of electricity because: Show Answer

Q635) CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the lattice energy of NaCl, the approximate lattice of CaO is Show Answer

Q636) The double bonds between the two carbon atoms in ethylene consists of: Show Answer

Q637) In which pair, the first atom or ion is not larger than the second? Show Answer

Q638) The maximum number of hydrogen bonds that a molecule of water can have is Show Answer

Q639) Dipole moment is exhibited by: Show Answer

Q640) In a multi-electron atom, the energy of a 2 p-orbital is: Show Answer

Q641) Ionization energy of nitrogen is more than oxygen because: Show Answer

Q642) The high melting point and insolubility in organic solvents of sulphanilic acid are due to its---structure Show Answer

Q643) Which of the following does not have a coordinate bond? Show Answer

Q644) Which of the following sequence regarding ionisation potential of coinage metal is correct: Show Answer

Q645) Which, molecule has zero dipole moment? Show Answer

Q646) Hybridisation of the underline atom changes in Show Answer

Q647) Which molecule has hydrogen bonding Show Answer

Q648) The energy released when a neutral gaseous atom takes up an electron is called: Show Answer

Q649) The decreasing order of the second ionization energy of K, Ca and Ba is: Show Answer

Q650) Compound X is anhydride of sulphuric acid. The number of σ bonds and the number of π - bonds present in X are, respectively. Show Answer

Q651) Which is not true in case of ionic bond? Show Answer

Q652) Strongest hydrogen bond is present in Show Answer

Q653) In the cyanide ion, the formal negative charge is on: Show Answer

Q654) The trigonal bipyramidal geometry results from the hybridisation Show Answer

Q655) Which one of the following molecules has the smallest bond angle? Show Answer

Q656) Which of the following is non – linear molecule? Show Answer

Q657) Which contains both covalent and ionic bonds? Show Answer

Q658) In the formation of NaCl by combination of Na and Cl: Show Answer

Q659) Which of the following has linear structure? Show Answer

Q660) The lowest ionization energy would be associated with the electronic structure: Show Answer

Q661) Which is correct in the following? Show Answer

Q662) Which one of the following compounds has the smallest bond angle in its molecule? Show Answer

Q663) In which of the following ionisation processes, the bond order has increased and the magnetic behaviour has changed? Show Answer

Q664) The size of ionic species is correctly given in the order: Show Answer

Q665) Which of the following has the minimum bond length? Show Answer

Q666) In acetylene molecule, between the carbon atoms there are Show Answer

Q667) Bond order of 1.5 is shown by: Show Answer

Q668) In which of the process, the bond order increases and magnetic behaviour changes? Show Answer

Q669) Which involves a bond forming process? Show Answer

Q670) Which is paramagnetic? Show Answer

Q671) Which one of the following pairs of molecules will have permanent dipole moments for both members? Show Answer

Q672) The correct order towards bond angle is Show Answer

Q673) Which of the following is a linear molecule? Show Answer

Q674) Which involves breaking of covalent bond? Show Answer

Q675) For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? Show Answer

Q676) An element X has 3 electrons in p-orbitals and also belongs to III period. Its molecular formula should be: Show Answer

Q677) Elements having six electrons in its outermost orbit generally form: Show Answer

Q678) Oxygen is divalent, but sulphur exhibits variable valency of 2, 4 and 6, because: Show Answer

Q679) Of the following sets which one does not contain isoelectronic species? Show Answer

Q680) Which transition involves maximum amount of energy? Show Answer

Q681) Maximum covalence of an atom of an element is equal to: Show Answer

Q682) Which main group elements have a different number of outermost electrons than their group number? Show Answer

Q683) The forces present in the crystals of naphthalene are: Show Answer

Q684) Which does not show inert pair effect? Show Answer

Q685) The electronic theory of bonding was proposed by Show Answer

Q686) The correct order of decreasing first ionization potential is: Show Answer

Q687) Which of the following is more ionic? Show Answer

Q688) The species showing pπ-dπ overlapping is: Show Answer

Q689) Among the following which is the strongest oxidising agent? Show Answer

Q690) Which of the following molecule in its valence shell has three bond pairs of electrons and one lone pair of electrons? Show Answer

Q691) Which of the following statements is correct? Show Answer

Q692) The formation of energy bonds in solids are in accordance with Show Answer

Q693) Which of the following configuration is associated with biggest jump between 2nd and 3rd IE ? Show Answer

Q694) The predominent intermolecular forces in hydrogen fluoride is due to: Show Answer

Q695) Correct order of bond length is Show Answer

Q696) Which of the following molecules has pyramidal shape? Show Answer

Q697) In which of the following arrangement the order is not correct according to property indicated against it? Show Answer

Q698) Most covalent halide of aluminium is: Show Answer

Q699) The bond order of individual carbon-carbon bonds in benzene is: Show Answer

Q700) The percentage s – character of the hybrid orbitals in methane, ethene and ethyne are respectively Show Answer

Q701) Which pair represents isostructural species? Show Answer

Q702) In which of the following species, all the three types of hybrid carbons are present? Show Answer

Q703) Which statement is not correct? Show Answer

Q704) The pair having similar geometry is: Show Answer

Q705) Which of the following is largest? Show Answer

Q706) Alkali metals in each period have: Show Answer

Q707) Valency means: Show Answer

Q708) Which does not form two or more chlorides? Show Answer

Q709) Which has the largest first ionisation energy? Show Answer

Q710) Polarization of electrons in acrolein may be written as: Show Answer

Q711) Which bond has the highest bond energy? Show Answer

Q712) In which of the following molecules the van der Waals’ forces is likely to be the most important in determining the melting and boiling point? Show Answer

Q713) The higher values of specific heat of water in comparison to other liquids is due to: Show Answer

Q714) Which contains both polar and non-polar covalent bonds? Show Answer

Q715) How many – bonds are present in naphthalene? Show Answer

Q716) If the electron pair forming a bond between two atoms A and B is not in the centre, then the bond is Show Answer

Q717) Which of the following species in non-linear? Show Answer

Q718) The bond order of CO molecule on the basis of molecular orbital theory is: Show Answer

Q719) Which one is the strongest bond? Show Answer

Q720) Which of the following compound has maximum volatility? Show Answer

Q721) Hybridisation shown by carbon and oxygen of –OH group in phenol are respectively Show Answer

Q722) The molecule which has pyramidal shape is: Show Answer

Q723) The correct increasing bond angles order is: Show Answer

Q724) Van der Waals’ forces are applied to: Show Answer

Q725) Which shows the least dipole moment? Show Answer

Q726) Which force is strongest? Show Answer

Q727) Which molecule has linear structure? Show Answer

Q728) Which ion has a higher polarizing power? Show Answer

Q729) The solubility of KCl is relatively more in (where D is dielectric constant): Show Answer

Q730) Elements have electronegativities 1.2 and 3.0, bond formed between them would be Show Answer

Q731) Among the following, the pair in which the two species are not isostructural, is Show Answer

Q732) Which has zero dipole moment? Show Answer

Q733) Which of the following molecules is covalent and shows expanded octet in its formation? Show Answer

Q734) Which one of the following is a correct set? Show Answer

Q735) Which property of halogens increases from F to I? Show Answer

Q736) The total number of bonds in acetylene molecule is: Show Answer

Q737) Variable valency is characteristic of: Show Answer

Q738) In which molecule all atoms are coplanar? Show Answer

Q739) Bond energy of covalent O—H bond in water is: Show Answer

Q740) Which one of the following has a coordinate bond? Show Answer

Q741) Which carbon is more electronegative? Show Answer

Q742) Paramagnetism is exhibited by molecules: Show Answer

Q743) Which molecule has the largest dipole moment? Show Answer

Q744) The intermolecular attractive forces vary in the order: Show Answer

Q745) Which of the following species has a linear shape? Show Answer

Q746) Which of the following will provide the most efficient overlap? Show Answer

Q747) Four diatomic species are listed below in different sequences. Which of these represents the correct order of their increasing bond order? Show Answer

Q748) Which one species has the longest bond length? Show Answer

Q749) The pair of molecules forming strongest hydrogen bonds are Show Answer

Q750) Which one of the following has not triangular pyramidal shape? Show Answer

Q751) A covalent bond is formed between the atoms by the overlapping of orbitals containing: Show Answer

Q752) Which of the following bonds required the largest amount of bond energy to dissociate the atom concerned? Show Answer

Q753) Which is distilled first? Show Answer

Q754) Which one of the following is a correct set? Show Answer

Q755) Which is correct order for electron gain enthalpy? Show Answer

Q756) Which is a pyramidal structure? Show Answer

Q757) Among the following mixtures, dipole – dipole as the major interaction, is present in Show Answer

Q758) In dry ice there are … in between molecules. Show Answer

Q759) The dipole moment of o,p and m-dichlorobenzene will be in the order Show Answer

Q760) Which formulae does not correctly represents the bonding capacity of the atom involved? Show Answer

Q761) Which has minimum ionic radius? Show Answer

Q762) The bond order is maximum in Show Answer

Q763) Resonance is due to: Show Answer

Q764) Which property is commonly exhibited by a covalent compound? Show Answer

Q765) Which of the following is an electrovalent linkage? Show Answer

Q766) Which metal has a greater tendency to form metal oxide? Show Answer

Q767) A p -block element in which last electron enters into s-orbitals of valence shell instead of p -orbital is: Show Answer

Q768) How many electron pairs are present in valence shell of oxygen in water molecule? Show Answer

Q769) Number of electrons in a the valence orbit of nitrogen in an ammonia molecule is Show Answer

Q770) The number of valency electrons in carbon atom is: Show Answer

Q771) Which one among the following does not have the hydrogen bond? Show Answer

Q772) Which of the following molecules/ions does not contain unpaired electrons. Show Answer

Q773) The C-O-H bond angle in ethanol is nearly Show Answer

Q774) Among the following elements Ca,Mg,P and Cl the order of increasing atomic radius is: Show Answer

Q775) Which has a giant covalent structure? Show Answer

Q776) Amongst the elements with following electronic configurations, which one of them may have the highest ionization energy? Show Answer

Q777) Which one of the following elements has lower value of ionisation energy? Show Answer

Q778) The lattice energy order for lithium halide is: Show Answer

Q779) Peroxide ion
(i) has five completely filled antibonding molecular orbitals
(ii) is diamagnetic
(iii) has bond order one
(iv) is isoelectronic with neon
Which one of these is correct?
Show Answer

Q780) Which is the weakest among the following type of bond? Show Answer

Q781) Bond length decreases with: Show Answer

Q782) Which of the following molecules/ ions does not contain unpaired electrons? Show Answer

Q783) In which of the following bond angle is maximum? Show Answer

Q784) The hybridisation of the ipso – carbon dichlorobenzene is Show Answer

Q785) Which of the following has maximum dipole moment? Show Answer

Q786) The molecule having largest dipole moment among the following is Show Answer

Q787) Which of the following diatomic molecules would be stabilized by the removal of an electron? Show Answer

Q788) Which of the following possess maximum hydration energy? Show Answer

Q789) In which of the following hydrogen bond is present? Show Answer

Q790) The correct order of decreasing polarisability of ion is: Show Answer

Q791) Which is highest melting point halide? Show Answer

Q792) Number of σ and π bonds in acetylene are Show Answer

Q793) Which of the following halides is least stable and has doubtful existence? Show Answer

Q794) C-C bond length is maximum in Show Answer

Q795) Resonance is not shown by: Show Answer

Q796) In which of the following compounds, the bonds have the largest percentage of ionic character: Show Answer

Q797) The linear structure is possessed by: Show Answer

Q798) Which species has the maximum number of lone pair of electrons on the central atom? Show Answer

Q799) Which concept best explains that o-nitrophenol is more volatile than p-nitrophenol? Show Answer

Q800) The comparatively high b.p. of HF is due to Show Answer

Q801) Which one of the following species is diamagnetic in nature? Show Answer

Q802) The unequal sharing of bonded pair of electrons between two atoms in a molecule gives rise to: Show Answer

Q803) In which of the following process energy is liberated? Show Answer

Q804) Identify the least stable ion amongst the following: Show Answer

Q805) The lowest bond energy exist in the following bonds for: Show Answer

Q806) Which one is electron deficient compound? Show Answer

Q807) Pauling’s electronegativity values for elements are useful in predicting: Show Answer

Q808) 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

Q809) Which has triangular planar shape? Show Answer

Q810) Which of the following molecule has highest bond energy? Show Answer

Q811) Which one of the following pairs of species have the same bond order? Show Answer

Q812) Which hybridization results non-polar orbitals? Show Answer

Q813) The element with strong electropositive nature is: Show Answer

Q814) Which statement is correct? Show Answer

Q815) Which one of the following sets of ions represents a collection of isoelectronic species? Show Answer

Q816) Which molecule has zero dipole-moment? Show Answer

Q817) Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them: Show Answer

Q818) Which one of the following compounds has bond angle as nearly 90°? Show Answer

Q819) In which of the following pair both molecules do not possess same type of hybridisation? Show Answer

Q820) Which is the most covalent? Show Answer

Q821) Which of the ions has the largest ionic radius? Show Answer

Q822) Which of the following is not isoelectronic? Show Answer

Q823) In which set of molecules are all the species paramagnetic? Show Answer

Q824) Which of the following has strongest hydrogen bonding? Show Answer

Q825) The angle between two covalent bonds is maximum in: Show Answer

Q826) The pair having similar geometry is Show Answer

Q827) In the electronic structure of acetic acid there are: Show Answer

Q828) Increasing order (lower first) of size of the various hybridised orbitals is: Show Answer

Q829) Among the following, the compound that contains ionic, covalent and coordinate linkage is Show Answer

Q830) The bond length is maximum in: Show Answer

Q831) Which of the following has maximum number of lone pairs associated with Xe? Show Answer

Q832) Which is most volatile compound? Show Answer

Q833) In which of the following pairs bond angle is 109 ͦ28′ ? Show Answer

Q834) Which of the following molecules has three-fold axis of symmetry? Show Answer

Q835) In which of the following arrangements the sequence is not strictly according to the property written against it? Show Answer

Q836) Which one of the following is paramagnetic? Show Answer

Q837) Which of the following has largest ionic radius? Show Answer

Q838) Lattice energy of a solid increases if Show Answer

Q839) Which one is most polar? Show Answer

Q840) The high boiling point of water is due to: Show Answer

Q841) In which pair of species, both species do have the similar geometry? Show Answer

Q842) Which of the following is largest ion? Show Answer

Q843) The electronic configuration of sodium and chlorine justifies: Show Answer

Q844) Glycerol is more viscous than ethanol due to Show Answer

Q845) In the case of alkali metals, the covalent character decreases in the order: Show Answer

Q846) Two nodal planes are present in Show Answer

Q847) H – bond is not present in Show Answer

Q848) In which of the following pairs molecules have bond order three and are isoelectronic? Show Answer

Q849) Which of the following halides has maximum melting point? Show Answer

Q850) Which atomic orbital is always involved in sigma bonding only? Show Answer

Q851) Which of the following acts sometimes as a metal and sometimes as a non-metal? Show Answer

Q852) Amongst the following elements the configuration having the highest ionization energy is: Show Answer

Q853) Which is a good solvent for ionic and polar covalent compounds? Show Answer

Q854) The following salt shows maximum covalent character Show Answer

Q855) Each of the followings has non-zero dipole moment, except: Show Answer

Q856) Resonance structures can be written for Show Answer

Q857) Born-Haber cycle may be used to calculate Show Answer

Q858) In which element shielding effect is not possible? Show Answer

Q859) Which of the following is isoelectronic with carbon atom? Show Answer

Q860) Which of the following statement is correct? Show Answer

Q861) The value of bond order in nitrogen and oxygen molecule is: Show Answer

Q862) Pauling received Nobel Prize for his work on: Show Answer

Q863) The enhanced force of cohesion in metals is due to: Show Answer

Q864) Among HX, the maximum dipole moment is of: Show Answer

Q865) Dative bond is present in: Show Answer

Q866) Which has an odd electron and shows paramagnetic character? Show Answer

Q867) Which species is paramagnetic? Show Answer

Q868) Structure of ammonia is Show Answer

Q869) The example of the p-p-orbital overlapping is the formation of: Show Answer

Q870) In which of the following pπ - dπ bonding is observed? Show Answer

Q871) Which has the lowest bond angle? Show Answer

Q872) The energy of antibonding molecular orbitals is: Show Answer

Q873) The set representing the correct order of ionic radius is: Show Answer

Q874) Which of the following hydrogen bonds is the strongest? Show Answer

Q875) Which of the following statements is most correct? Effective nuclear charge of an atom depends on: Show Answer

Q876) Phosphoric acid is syrupy in nature due to Show Answer

Q877) The correct order of bond angles is: Show Answer

Q878) Metallic lusture is explained by Show Answer

Q879) Which of the following phenomenon will occur when two atoms of same spin will react? Show Answer

Q880) Among the following the pair in which the two species are not isostructural is Show Answer

Q881) Which of the following species contains three bond pairs and one lone pair around the central atom? Show Answer

Q882) Intramolecular hydrogen bonding is found in: Show Answer

Q883) 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

Q884) Which of the following has minimum melting point? Show Answer

Q885) Geometry of ammonia molecule and the hybridisation of nitrogen involved in it are Show Answer

Q886) The molecule having smallest bond angle is Show Answer

Q887) For a covalent solid, the units which occupy lattice points are: Show Answer

Q888) The ionization energy will be maximum for the process: Show Answer

Q889) Born Haber cycle is used to determine: Show Answer

Q890) Which of the following element has higher ionisation energy? Show Answer

Q891) In a double bond connecting two atoms there is a sharing of: Show Answer

Q892) Elements whose electronegativities are 1.2 and 3.0 form: Show Answer

Q893) Which of the following is correct? Show Answer

Q894) Ionisation potential values of ‘d’ block elements as compared to ionisation potential values of ‘f’ block elements are: Show Answer

Q895) When a metal atom combines with a non-metal atom, the non-metal atom will Show Answer

Q896) The hydration of ionic compounds involves: Show Answer

Q897) Which of the following is diamagnetic? Show Answer

Q898) According to Fajan’s rule polarization is more when: Show Answer

Q899) Organic compounds soluble in water contain: Show Answer

Q900) Atomic radii of fluorine and neon in angstrom unit are respectively given by: Show Answer

Q901) The decreasing order of bond angle is Show Answer

Q902) The correct order of dipole moment is: Show Answer

Q903) Which of the following molecules does not possess a permanent electric dipole moment? Show Answer

Q904) Among O, C, F, Cl, Br the correct order of increasing atomic radii is: Show Answer

Q905) In which of the following diatomic molecules /ions is the bond order of each molecule/ion =2.5? Show Answer

Q906) Debye an unit of dipole moment is of the order of: Show Answer

Q907) Which of the following is a favourable factor for cation formation? Show Answer

Q908) The paramagnetic molecule at ground state among the following is Show Answer

Q909) The bond in the formation of fluorine molecule will be Show Answer

Q910) The diamagnetic molecules are: Show Answer

Q911) In the following, which bond will be responsible for maximum value of hydrogen bond? Show Answer

Q912) The fHOMO in CO is Show Answer

Q913) Coordinate compounds are formed by: Show Answer

Q914) Which shows non-directional bonding? Show Answer

Q915) Which one of the following contains both ionic and covalent bonds? Show Answer

Q916) Which of the following does not apply to metallic bond? Show Answer

Q917) Van der Waals’ forces are maximum in: Show Answer

Q918) The molecule having zero dipole moment is Show Answer

Q919) For a stable molecule, the value of bond order must be Show Answer

Q920) Which compound among the following has more covalent character? Show Answer

Q921) Which among the following has the largest dipole moment? Show Answer

Q922) A square planar complex is formed by hybridisation of the following atomic orbitals Show Answer

Q923) Which of the following pairs are isostructural? Show Answer

Q924) Hydration of different ions in aqueous solution is an example of Show Answer

Q925) Atoms or group of atoms which are electrically charged are known as: Show Answer

Q926) Which among the following elements has lowest value of ionisation energy? Show Answer

Q927) Which one pair of atoms or ions will have same configuration? Show Answer

Q928) Which combination is best explained by the coordinate covalent bond? Show Answer

Q929) Which shows the highest lattice energy? Show Answer

Q930) The correct order regarding the electronegativity of hybrid orbitals of carbon is: Show Answer

Q931) Which of the following compounds does not follow the octet rule for electron distribution? Show Answer

Q932) Which of the following sets represents the collection of isoelectronic species? Show Answer

Q933) Which of the following has unchanged valency? Show Answer

Q934) Which molecule has trigonal planar geometry? Show Answer

Q935) Malleability and ductility of metals can be accounted due to Show Answer

Q936) Hydrogen fluoride is a liquid unlike other hydrogen halides because: Show Answer

Q937) The number of sigma (σ)and pi (π) covalent bonds respectively in banzene nitrile are Show Answer

Q938) In which one of the following cases, breaking of covalent bond takes place? Show Answer

Q939) Which compound is soluble in water Show Answer

Q940) Which statement is true? Show Answer

Q941) Which compound does not contain double bond or triple bond? Show Answer

Q942) The compound showing maximum covalent character is: Show Answer

Q943) Which statement is wrong? Show Answer

Q944) Among the following, the paramagnetic compound is Show Answer

Q945) HCl molecule in the vapour state is an example of: Show Answer

Q946) The electrons in an incomplete outershell are known as: Show Answer

Q947) The element which exists in both hard and soft form is: Show Answer

Q948) Which of the following is not a correct statement? Show Answer

Q949) The bond strength increases: Show Answer

Q950) Which has higher bond energy and stronger bond? Show Answer

Q951) Which of the following statements regarding carbon monoxide is correct? Show Answer

Q952) Which of the following is having highest bond length? Show Answer

Q953) Which does not have pyramidal geometry? Show Answer

Q954) Which of the following oxides is not expected to react with sodium hydroxide? Show Answer

Q955) How many medal india win in Singapore Weightlifting International ? Show Answer

Q956) How many gold medal india win in Singapore Weightlifting International ? Show Answer

Q957) National Science Day is celebrated on Show Answer

Q958) Which countries abstained from voting on UNSC resolution against Russia's invasion of Ukraine? Show Answer

Q959) Which of the following is least ionic? Show Answer

Q960) Choose the polar molecule from the following Show Answer

Q961) Given below are two statements.
Statement I Dipole moment is a vector quantity and by convention it is depicted by a small arrow with tail on the negative centre and head pointing towards the positive centre.
Statement II The crossed arrow of the dipole moment symbolises the direction of the shift of charges in the molecules.
In the light of the above statements, choose the most appropriate answer from the options given below. Show Answer

Q962) Which of the following pair of molecules contain odd electron molecule and an expanded octet molecule? Show Answer

Q963) Among the following, the maximum covalent character is shown by the compound Show Answer

Q964) Among the following mixtures, dipole-dipole as the major interaction, is present in Show Answer

Q965) Given below are two statements: one is labelled as
Assertion (A) and the other is labelled as Reason (R).
Assertion (A) cis-form of alkene is found to be more polar than the trans-form.
Reason (R) Dipole moment of trans-isomer of 2-butene is zero.
In the light of the above statements, choose the correct answer from the options given below. Show Answer

Q966) Which one of the following molecules has maximum dipole moment? Show Answer

Q967) The bond order and magnetic property of acetylide ion are same as that of its Show Answer

Q968) The most polar compound among the following is Show Answer

Q969) Which compound exhibits maximum dipole moment among the following? Show Answer

Q970) Identify the species having one pi - bond and maximum number of canonical forms from the following Show Answer

Q971) The total number of lone pairs of electrons on oxygen atoms of ozone is . . . . . Show Answer

Q972) Which of the following will have lowest dipole moment. Show Answer

Q973) Among the given compounds, which one exhibits maximum dipole moment? Show Answer

Q974) Amongst the following, the linear species is Show Answer

Q975) A central atom in a molecule has two lone pairs of electrons and forms three single bonds. The shape of this molecule is Show Answer

Q976) The molecule/ion with square pyramidal shape is Show Answer

Q977) Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) Zero orbital overlap is an out of phase overlap.
Reason (R) It results due to different orientation/direction of approach of orbitals. In the light of the above statements, choose the correct answer from the options given below: Show Answer

Q978) The molecule in which hybrid MOs involve only one d-orbital of the central atom is Show Answer

Q979) Identify the pair in which the geometry of the species is T-shape and square-pyramidal, respectively Show Answer

Q980) The incorrect geometry is represented by Show Answer

Q981) Which of the following conversions involves change in both shape and hybridisation? Show Answer

Q982) The group of molecules having identical shape is Show Answer

Q983) Which of the following has maximum number of lone pairs associated with Xe? Show Answer

Q984) In which of the following molecules/ions, all the bonds are not equal? Show Answer

Q985) The pair of species having identical shapes for molecules of both species, is Show Answer

Q986) In which of the following pairs, the two species are not isostructural? Show Answer

Q987) Central atom of a molecule has one lone pair of electron and forms five bond pairs. The shape of this molecule is Show Answer

Q988) Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) Dipole-dipole interactions are the only non-covalent interactions, resulting in hydrogen bond formation.
Reason (R) Fluorine is the most electronegative element and hydrogen bonds in HF are symmetrical.
In the light of the above statements, choose the most appropriate answer from the options given below. Show Answer

Q989) According to molecular orbital theory, the species among the following that does not exist is Show Answer

Q990) The correct order of increasing intermolecular hydrogen bond strength is Show Answer

Q991) Among the following species, the diamagnetic molecule is Show Answer

Q992) According to molecular orbital theory, which of the following will not be a viable molecule? Show Answer

Q993) Which of the following is paramagnetic? Show Answer

Q994) Which of the following species exhibits diamagnetic behaviour? Show Answer

Q995) Which of the following hydrogen bond is the strongest? Show Answer

Q996) Which of the following molecules/ions does not contain unpaired electrons? Show Answer

Q997) Which one of the following molecules is expected to exhibit diamagnetic behaviour? Show Answer

Q998) In which of the following pairs of molecules/ions both the species are not likely to exist? Show Answer

Q999) In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic? Show Answer

Q1000) Using MO theory, predict which of the following species has the shortest bond length? Show Answer

Q1001) Which one of the following pairs of species have the same bond order? Show Answer

Q1002) The total number of molecular orbitals formed from 2s and 2p atomic orbitals of a diatomic molecule is . . . . . Show Answer

Q1003) The total number of anti-bonding molecular orbitals, formed from 2s and 2p atomic orbitals in a diatomic molecule is . . . . . Show Answer

Q1004) The pair of species with the same bond order is Show Answer

Q1005) Which of the following hydrogen bond is strongest? Show Answer