Q 1.
Q 2.
Which of the following pairs has identical values of bond order?
(a) F2 and Ne2
(b) C2 and N2
(c) N 2 and O2
(d) All of these
Species having zero bond order are:
(a) He2
(b) N 2
(d) All of these
(c) O2
Q 3.
Which of the following species contain covalent co-ordinate bonds?
(a) AlCl2
(b) CO
(c) N 3
(d) All of these
Q 4.
Choose the incorrect statement:
(a) A p1 bond is weaker than sigma bond
(b) A sigma bond is weaker than pi bond
(c) A (=) bond is stronger than sigma bond (d) A covalent bond is stronger than H-bond
Q 5.
the:
Intermolecular hydrogen bonding increases the enthalpy of vaporization of a liquid due to
(a) decrease in the attraction between molecules
(b) increase in the attraction between molecules
(c) decrease in the molar mass of unassociated liquid molecules
(d) decrease in the effective molar mass of hydrogen-bonded molecules
Q 6.
Which of the following have identical bond order?
(a) He2
(b) O2
(c) NO+
(d) CN+
Q 7. Which of the following diatomic molecules would be stabilized by the removal of an
electron?
(a) C2
(b)CN
(c) N2
(d) O2
Q 8.
Q 9.
Which of the following oxyacids of sulphur contain S-S bonds?
(a) H2S2O8
(b) H2S2O6
(c) H2SO5
(d) None of these
In which one of the following cases, breaking of covalent bond takes place?
(a) Boiling of H2O
(b) Melting of KCN (c) Boiling of CF4
(d) Melting of SiO2
Q 10. The property not attributed to ionic compound is:
(a) high melting points and low boiling points
(b) high melting points and non-directional bonds
(c) high solubilities in polar solvents and low solubilities in non-polar solvents
(d) two dimensional network structures, and are good conductors of electricity in the
molten state
Q 11. Which of the following statements is correct?
(a) HCI is covalent both in aqueous solution and in the gaseous state
(b) HC1 is covalent in the gaseous state but ionic in aqueous solution
(c) HC1 is ionic both in the gaseous state and in aqueous solution
(d) None of the above
Q 12. Which of the following species is non linear?
(a) ICI2(b) I3(c) N 3
(d) ClO2
Q 13. Which of the following molecules has three fold axis of symmetry?
(a) NH3
(b) C2H4
(c) CO2
(d) SO2
Q 14. The shapes of XeF6, Xe F5 and Xe F82  are:
(a) octahedral, trigonal bipyramidal and square planar respectively
(b) square pyramidal, pentagonal bipyramidal an octahedral respectively F
(c) square planar, pentagonal and square antiprismatic respectively
(d) see-saw, T-shaped and square pyramidal respectively
Q 15. Among the following species, identify the isostructural. pairs
NF3, N O3 BF3, H 3 O, HN3 :
(a) [ NF3, NO3] and [ BF3, H 3 O3]
(b) [ NF3, HN3] and [ N O3 , BF3]
(c) [ NF3, H 3 O] and [ N O3 , BF3]
(d) [ NF3, H 3 NO] and [ HN3, BF3]
Q 16. Among the following structures, which is not a permissible resonance form?
(a)
(b)
(c)
(d)
Q 17. Paramagnetic species is/are:
(a) O22
(b) N2
(c) N 22
(d) all of these
Q 18. The H bond in solid HF can be best represented as:
(a)
(b)
(c)
(d)
Q 19. The electronic configurations of four elements are:
L : 1s2 2s2 2p4
Q : 1s2 2s2 2p6 3s2 3p5
P : 1s2 2s2 2p6 3s1
R : 1s2 2s2 2p6 3s2
The formulae of ionic compounds that could be formed between them are:
(a) L2P, RL, PQ, R2Q (b) LP, RL, PQ, RQ (c) P2L, RL, PQ, RQ2 (d) LP, R2L, P2Q, RQ
Q 20. Which of the following species has a bond order other than 3 ?
(a) CO
(b) CN(c) NO+
(d) O2
Q 21. Which of the following combination of orbitals is correct ?
(a)
(b)
(c)
(d)
Q 22. Which of the following have an (18 + 2) electron configuration ?
(a) S O42
(b) Bi+3
(c) Cd2+
(d) All of these
Q 23. KP combines with HF to form KHF2- The compound contains the species:
(a) K+, F- and H+
(b) K+, F- and HF
(c) K+ and [ HF2]
(d) [KHF]+ and F2
Q 24. Which .of the following has dipole moment ?
(a) 1, 4-dichlorthenzene
(b) cis-1,2-dichloroethene
(c) trans-1, 2 – dichloroethene
(d) trans-1, 2-dichloropentene
Q 25. Which type of bond is not present in HNO2 molecule?
(a) Covalent
(b) Co-ordinate
(c) Ionic
co-ordinate
Q 26. The element which does not show inert pair effect is:
(a) Bi
(b) Sn
(c) Pb
(d) Ionic as well as
(b) C
Q 27. The cyanide ion, CN- and N2 are isoelectronic. But in contrast to CN N is chemically
inert, because of :
(a) low bond energy
(b) absence of bond polarity
(c) unsymmetrical electron distribution
(d) presence of more number of electrons in bonding orbitals
Q 28. Which of the following is incorrect ?
(a) During N 2 formation, one electron each is removed from the bonding molecular
orbitals
(b) During O2 formation, one electron each is removed from the antibonding molecular
orbitals
(c) During O2 formation, one electron each is added to the bonding molecular orbitals
(d) During CN- formation, one electron each is added to the bonding molecular orbitals
Q 29. Species having bond order 2
1
are :
2
(b) O22
(a) N 22
(c) O2
(d) none of these
Q 30. The molecule having intramolecular H-bonding:
(a) KH2PO4
(b) H3BO3
(c) C6H5CO2H
(d) CCl3CH(OH)2
Q 31. Which of the following have a three-dimensional network structure?
(a) CCl4
(b) P4 (white)
(c) (BN)x
(d) All of these
Q 32. The molecular electronic configuration of Be is:
(a) 1s2 1s2 2s2 2p2
(b) kk 2s2
(c) 1s2  1s2  2s2  2s2
(d) none of the above
Q 33. Ths structure of XeF6 is:
(a) pentagonal bipyrarnidal
(c) square pyramidal
(b) capped octohedral
(d) none of the above
Q 34. Which of the following statements is correct?
(a) The crystal lattice of ice is mostly formed by covalent as well as hydrogen bonds
(b) The density of water decreases when heated from 0°C to 4°C due to the change in the
structure of the cluster of water molecules
(c) Above 4°C the thermal agitation of water molecules decreases, therefore,
intermolecular distance increases and water starts expanding
(d) The density of water increases from 0°C to a maximum a’ 4°C because the entropy of
the system decreases
Q 35. Given electronic configuration of four elements as
(i) 1s2
(ii) 1s2 2s2 2p2
(iii) 1s2 2s2 2p5
(iv) 1s2 2s2 2p6
Answers
1.
8.
15.
22.
29.
c
b
c
b
c
2.
9.
16.
23.
30.
a
d
b
c
d
3.
10.
17.
24.
31.
b
d
c
b
c
4.
11.
18.
25.
32.
b
b
c
d
c
5.
12.
19.
26.
33.
b
d
c
d
b
6.
13.
20.
27.
34.
c
a
d
b
a
7.
14.
21
28
35.
d
c
b
c
c