Multiple Choice Question For Practice: 8. Nature Of Chemical Bond:

8. Nature Of Chemical Bond:

1. Which of the following molecules involves electrovalent bond

    a) H₂                              b) CH₄

    c) CaCl₂                         d)  HCl

2. The tetravalency of carbon is explained by its

    a) ground state E.C.     b) excited state E.C.

    c) sp³ hybridisation      d) sp² hybridisation

3. Among the following, the molecule with linear geometry is 

    a) C₂H₄                            b) BeF₂

    c) NH₃                             d) H₂O

4. Total no. of sigma bonds involved in ethylene

molecule are

    a) 3                                 b) 5

    c) 2                                 d) 1

5. The angle between two covalent bond is minimum in

    a) CH₄                             b) C₂H₂

    c) NH₃                             d) H₂O

6. The hybrid orbitals with 25% s character is involved in the formation of 

    a) either sigma or pi bonds

    b) only sigma bonds

    c) only pi bonds

    d) both sigma and pi bonds together

7. Non directional bond is present in  

    a) HCl                             b) HF

    c) F₂                                d) H₂

8. According to valence bond theory expected valency of boron is

    a) 0                                b) 1

    c) 2                                d) 3

9. Octet rule is not violated in case of

    a) methane                      b) boron trifluoride

    c) sulphur hexafluoride d) aluminium chloride

10. In H₂O molecule each O-H bond involves

    a) sp³-s overlap           b) sp²-s overlap

    c) sp-s overlap            d) 2p-s overlap

11. The hybrid orbitals give stronger covalent bond due to

    a) their orientation      b) larger extent of overlap

    c) their similar shapes d) the presence of unpaired e^-

12. In forming compound AB, an electron is transferred from A TO B then

    a) A is divalent           

    b) B is oxidised

    c) A and B are covalently bonded                              

    d) the compound AB is electrovalent 

13.Which of the following compound is an ionic compound

    a) SO₃                            b) ICl

    c) KI                               d) CHCl₃

14. A true covalent bond is formed by

    a) transfer of electron from one atom to the other                                     

    b) mutual sharing of e^-

    c) one sided sharing of e^-

    d) none of these

15. Lateral overlap of p-orbitals leads to the formation of

    a) π bond                     b) metallic bond

    c) σ bond                     d) ionic bond

16. Fluorine molecule is formed by

    a) p-p orbitals(side wise overlap)

    b) p-p orbitals (end to end overlap)

    c) sp-sp orbitals overlaps

    d) s-s orbitals overlaps

17. Which of the following will provide most efficient overlap?

    a) s-s overlap              b) s-p overlap

    c) sp²-sp² overlap         d) sp-sp overlap

18. In which of the following species the bonds are non-directional?

    a) NCl₃                            b) RbCl

    c) BeCl₂                          d) BCl₃

19. Intramolecular hydrogen bonding is present in

    a) o-Nitrophenol          b) salicylaldehhyde

    c) m-nitrophenol          d) both a) and b)

20. Which of the following is appreciably soluble in water?

    a) Cs₂                              b) C₂H₅OH

    c) CCl₄                            d) CHCl₃

21. The weakest bond among the following is

    a) ionic bond                 b) metallic bond

    c) covalent bond          d) hydrogen bond

22. The geometry of sp³d² hybrid orbitals is

    a) linear                          b) octahedral

    c) triangular                   d) trigonal bypyramidal  

23. Which of the following molecule has largest bond angle?

    a) H₂O                             b) NH₃

    c) CO₂                              d) CH₄

24. The shape of ClF₃ molecule is,

    a) triangular planar      b) pyramidal

    c) T-shape                      d) triangular pyramidal

25. Which of the following has smallest bond length?

    a) O₂                                b) N₂

    c) Cl₂                                d) HCl

26. When a chemical bond between two atoms is formed, the potential energy of the system

    a) decreases                  b) increases  

    c) remains the same    d) cannot be predicted

27. The strength of a bond depends upon

    a) free rotation about a bond

    b) extent of overlapping between the orbitals   

    c) resonance in the molecule

    d) whether overlap is axial or sidewise  

28. In a N₂ molecule there are

    a) one sigma and one pi bond

    b) one sigma and two pi bond

    c) two sigma and one pi bond

    d) three sigma bonds

29. The molecular orbitals formed as a result of LCAO method obeys

    a) pauli’s exclusion principle

    b) aufbau principle  

    c) Hund’ rule of maximum multiplicity

    d) all of these  

30. A He₂ molecule is not formed because

    a) N_b= N_a                         b) N_b > N_a

    c) N_b< N_a                         d) N_b - N_a = +ve

31. The O₂ molecule is paramagnetic. It is explained on the basis of

    a) hybridisation            b) VBT

    c) MOT                           d) VSEPR

32. In O₂ molecule, the empty molecular orbital is  

    a) σ2s                             b) σ*2s

    c) σ2p_z                           d) σ*2p_z

33. Bond order is ……

    a) directly related to bond length                                   

    b) inversely related to bond length

    c) inversely related to bond strength                                      

    d) never fractional