Chemical Bonding

1. Which of the following molecules has coplanar structure only?

A) NF, B) C,CL,

C) C3Hg D) C3Hg  

2. The shape of CO, molecule is similar to that of:

A) HS B) SO,

C) BeF, D) SnCL,

3. Number of electrons shared bySF molecule are:

A)4 B) 12

C6 D)8

4. Which of the following has trigonal pyramidal structure?

A) SO, B) PCL;

C) CCL, D)H,0

5. Which of the following statements is/are not correct regarding bonding molecular orbitals?

A) Bonding M.Os possess less energy than atomic Os

B) Bonding M.Os have low electron density between the two nuclei

C) Every electron in the bonding M.Os contributes to the attraction between atom

D) Bonding M.Os are formed when the electron waves undergo constructive interference

6. Mark the incorrect statement about ionic bonds:

A) The element of IA and ITA groups chemically combine with the element of VIA and VIIA groups to ionic bond

B) Ionic bond are non-directional and non-rigid

C) lonic bond are stronger than covalent bond

D) lonic bond are also know as electron pair bond

7. Bond order of 0,+2 molecule is:

A)3 B) 1

C)2D)1.5

8. In all of the following compounds the central atom has less electrons than octet EXCEPT:

A) BF, B) BF,-1

C) BeCL, D) AICLs,

O. According to VSEPR theory, which of the following is not basic condition for the regular geometry:

A) Central atom 1s surrounded by similar atom

B) Central atom has no lone pair

C) Molecule has similar bond

D) The electronegativity of central or surrounding atom affect the bond angle

10. Which one of the following is the most polar molecule?

A) C,H:OH B) CH;Br

C) H,0, D) SO,

11. Bond energy is greater in case of:

A) F, B) CL,

C)Br,D) I,

12. lonization energies of VA group elements is greater than that of VIA group elements because of:

A) Half-filled p sub-shell

B) Inert pair effect

C) Small size of VA element

D) All of these

13. All of the following belongs to AB3 type molecules EXCEPT:

A) NH3 B) SnCL,

C) SO; D) BF,

14. Which pair of compounds contain one that is giant ionic and the other is a simple molecule?

A) AL, Oszand AL, CL,

B) Si0,and SiCl,

C) PLO pand PCL,

D) HF and PbCl,

15. lonic compounds show all of the following properties EXCEPT:

A) All present in the solid state

B) All conduct electricity in the molten state

C) All show polymorphism and isomerism

D) All have non-directional and non-rigid bond

16. All of the following are correct statements regarding differencebetween sigma bond and pi-bond EXCEPT:

A. It 1s formed by linear overlapping of It is formed by

sidewise overlapping of two half-filled atomic orbitals. two half-filled parallel atomic orbitals.

B. It has restricted rotation about It has free rotation about the inter the inter-nuclear axis. nuclear axis.

C. It has one lobe of electron density It has two lobe of electron density on between the nuclei. opposite side of inter nuclear axis.

D. It has symmetrical charge density. It has no symmetrical charge density.

17. The hybridization in PCI5 molecule is:

A) sp? -hybridized B) dsp? -hybridized

C) dsp? -hybridized D) d?sp3 -hybridized

18. Which of the following has high electron affinity?

A) F B) CL

C)Br D)I

19. The percentage ionic character in NaCl is:

A) 92% B) 82%

C) 72% D) 78%

20. Which type of chemical bond is present in NH4CI?

A) Covalent B) Coordinate covalent

C) lonic D) All of these

21. Which of the following has greater dipole moment?

A) NH; B) HCL

C) CO, D) HF

22. The C2H2 molecule is linear which can be deduced from the numbers of sigma and pi bonds present in the molecule?

A) 22 B) 23

C) 32 D) 31

23. The relative energy of 4s, 4p and 3d orbitals are in the order of:

A) 3d <4p <4s B) 4s <4p <3d

C)4s<3d <4p D) 4p < 3d < 4s

24. According to Planck’s quantum theory of radiation, all of the following mathematical relationships are correct EXCEPT:

A) E xv B) V=-

C)Ex= D)E ~

725. Which of the following molecules has greater bond energy?

A)H-H B)O-0

C)N-N D) CL – CL