Exercise - 1
1. Which of the following contains Co- ordinate and covalent
bonds:
(a) N2𝑯+𝟓 (b) H3O+
(c) HCl (d) H2O
(1) a & d
(3) c & d
(2) a & b
(4) Only a
2. In Co-ordinate bond, the acceptor atoms must essentially
contain in its valence shell an orbital:
(1) With paired electron
(2) With single electron
(3) With no electron
(4) With three electron
3. Dative bond is present in:
(1) SO3
(2) K2CO3
(3) NH3
(4) BF3
4. Number of co-ordinate bond present in sulphuric acid are:
(1) 1
(2) 2
(3) 3
(4) 4
5. The number of co-ordinate bonds presents in SO3 molecule are:
(1) 1
(2) 2
(3) 3
(4) 4
6. The compound bond is: containing co-ordinate
(1) H2SO4
(2) O3
(3) SO3
(4) All of these
7. The ion that is isoelectronic with CO and having same bond
order is:-
(1) CN-
(2) 𝑶+ 𝟐
(3) 𝑶− 𝟐
(4) 𝑵+ 𝟐
8. Which of the following is paramagnetic:-
(1) 𝑶− 𝟐
(2) CN-
(3) CO
(4) NO+
9. Which has the bond order in fraction:-
(1) O2
(2) HeH+
(3) Co
(4) CN
10. Bond order in C_{2} + is:-
(1) 1/2
(2) 2/3
(3) 3/2
(4) 1
11. in the following which of the two are paramagnetic
(a) N2 (b) CO
(c) B2 (d) NO2
Correct answer is:-
(1) a and c
(2) b and c
(3) c and d
(4) b and d
12. Increasing order of bond length in NO, NO+ and NO- is:-
(1) NO > NO- > NO+
(2) NO+ < NO <NO-
(3) NO < NO+ < NO-
(4) NO < NO+ = NO-
13. Bond order of Li2 is:-
(1) 0
(2) 1
(3) 2
(4) 3
14. In which of the following set, the value of bond order will be
2.5:-
(1) 𝑶+ +2
𝟐 , NO, NO , CN
(2) CN, NO+2, CN-, F2
(3) 𝑶+ +2 +𝟐
𝟐 , NO , 𝑶𝟐 , CN
-
(4) 𝑶−𝟐 − +
𝟐 , 𝑶𝟐 , 𝑶𝟐 O2
15. Which of the following ion is diamagnetic:-
(1) 𝑶−𝟏
𝟐 ,
(2) 𝑶−𝟐
𝟐
(3) O2
(4) 𝑶+𝟏
𝟐
16. When two atomic orbitals combines, it forms:-
(1) One molecular orbital
(2) Two molecular orbital
(3) Two bonding molecular orbitals
(4) Two anti bonding molecular orbitals
17. The paramagnetic property of oxygen is well explained by:-
(1) Molecular orbital theory
(2) Resonance theory
(3) Valence bond theory
(4) VSEPR theory
18. Which of the following has fractional bond order?
(1) 𝑶𝟐+
𝟐 ,
(2) 𝑶𝟐−
𝟐
(3) 𝑭𝟐−
𝟐
(4) 𝑯𝟐−
19. The bond order of CO molecule on the basis of molecular
orbital theory is
(1) Zero
(2) 2
(3) 3
(4) 1
20. The diamagnetic molecule is
(1) Super oxide ion
(2) Oxygen molecule
(3) Carbon molecule
(4) Unipositive ion of nitrogen molecule
21. Which of the following group of molecules have 2½ bond
order:-
(1) 𝑵𝟐 −𝟐 , 𝑶𝟐 −𝟐 , CO
(2) 𝑵+ +
𝟐 , 𝑶𝟐 , NO
(3) 𝑪𝟐 −𝟐 , B2, O2
(4) CN-, NO+, 𝑶𝟐 +𝟐
22. The molecule having one unpaired electron is
(1) NO
(2) CO
(3) CN-
(4) O2
23. The no. of antibonding electron pair in 𝑶𝟐 − is
(1) 4
(2) 3
(3) 8
(4) 10
24. Maximum bond energy will be shown by the species
(1) 𝑶𝟐 +
(2) O2
(3) 𝑶𝟐 −
(4) 𝑶𝟐 −𝟐
25. Which of the following species will have the minimum bond
energy
(1) N2
(2) 𝑵𝟐 −
(3) 𝑵𝟐 +
(4) 𝑵𝟐 −𝟐
26. Which of the following ion do not have bond order of 2.5?
(1) 𝑶𝟐 −
(2) 𝑶𝟐 +
(3) 𝑵𝟐 +
(4) 𝑵𝟐 −
27. In which of the following pairs of molecules/ions, both the
species are not likely to exist?
(1) 𝑯𝟐+
𝟐 , He2
(2) 𝑯−𝟐
𝟐 , 𝑯𝒆𝟐
𝟐+
(3) 𝑯+𝟐 , 𝑯𝒆𝟐
𝟐+
(4) 𝑯− 𝟐 , 𝑯𝒆𝟐
𝟐−
28. Which of the following species is paramagnetic with one
unpaired electron?
(1) BaO2
(2) CaC2
(3) O2
(4) KO2
29. Stability of the species Li2, 𝑳𝒊𝟐+ and 𝑳𝒊−
𝟐 Increases in the
order is:
(1) Li2 <Li2 < 𝑳𝒊+𝟐
(2) Li2 < 𝑳𝒊𝟐 < 𝑳𝒊𝟐−
+
(3) 𝑳𝒊− +
𝟐 < 𝑳𝒊𝟐 < Li2
(4) Li2 < Li2 < 𝑳𝒊𝟐+
30. Intermolecular hydrogen bonds are not present in:-
(1) CH3CH2OH
(2) CH3COOH
(3) C2H5NH2
(4) CH3OCH3
31. In which of the following molecule, the shown hydrogen bond
is not possible:-
32. Correct order of volatility is:-
(1) HF > HCl > HBr > HI
(2) HCL > HBr > HI > HF
(3) Hl > HBr > HCl > HF
(4) HBr < HCL < HI < HF
33. Glycerol is more viscous than glycol the reason is:-
(1) Higher molecular wt.
(2) More covalent
(3) More extent of hydrogen bonding
(4) Complex structure
34. Maximum number of H-bonding is shown by
(1) H2O
(2) H2Se
(3) H2S
(4) HF
35. Intermolecular H-bond:-
(1) Decreases Volatility
(2) Increases boiling point
(3) Increases viscosity
(4) All of these
36. The incorrect order of decreasing boiling points is
(1) NH3 > AsH3 > PH3
(2) H2O > H2Se > H2S
(3) Br2 > Cl2 > F2
(4) CH4 > GeH4 > SiH4
37. The crystal lattice of ice is mostly formed by:-
(1) Ionic forces
(2) Covalent bonds
(3) Inter molecular H-bonds
(4) Covalent as well as H-bonds
38. Acetic acid exists as dimer in benzene due to:-
(1) Condensation reaction
(2) Hydrogen bonding
(3) Presence of carboxyl group
(4) None of the above
39. Which of the following does not form a hydrogen bond with
water
(1) (CH3)2CO
(2) CH3CN
(3) CH3OH
(4) C2H6
40. Maximum no. of hydrogen bonds formed by a water molecule in
ice is
(1) 4
(2) 3
(3) 2
(4) 1
41. In which of the following compounds Intramolecular hydrogen
bond is present
(1) Ethyl alcohol
(2) water
(3) Salicylaldehyde
(4) Hydrogen sulphide
42. Hydrogen bonding is formed in compounds containing
hydrogen and:
(1) Highly electro-negative atoms
(2) Highly electro-positive atoms
(3) Metal atoms with d-orbitals occupied
(4) Metalloids
43. Which of the following hydrides has the lowest b.p.
(1) H2O
(2) H2S
(3) H2Se
(4) H2Te
44. The intermolecular force in hydrogen fluoride is due to:
(1) Dipole-induced dipole interactions
(2) Dipole-dipole interactions
(3) Hydrogen bond
(4) Dispersion interaction
45. Strongest hydrogen bond is shown by:
(1) Water
(2) Ammonia
(3) Hydrogen fluoride
(4) Hydrogen sulphide
