Chemical Bonding and Molecular Structure – Multiple Choice Questions (MCQs)

1. 37. Which molecule has a bent shape due to lone pair-bond pair repulsion?

   • A. SO2
   • B. CO2
   • C. CS2
   • D. BeCl2

2. 38. The bond angle in BF3 is:

   • A. 120°
   • B. 109.5°
   • C. 104.5°
   • D. 180°

3. 39. The order of repulsion between electron pairs is:

   • A. Lone pair-lone pair > Lone pair-bond pair > Bond pair-bond pair
   • B. Bond pair-bond pair > Lone pair-bond pair > Lone pair-lone pair
   • C. Lone pair-bond pair > Lone pair-lone pair > Bond pair-bond pair
   • D. Bond pair-bond pair > Lone pair-lone pair > Lone pair-bond pair

4. 40. The valence electrons involved in bonding in CO2 are:

   • A. 4
   • B. 6
   • C. 8
   • D. 2

5. 41. Which of the following elements can expand its octet?

   • A. Phosphorus
   • B. Carbon
   • C. Nitrogen
   • D. Oxygen

6. 42. Metallic bond is due to the attraction between:

   • A. Positive metal ions and delocalized electrons
   • B. Two metal atoms
   • C. Metal ions and non-metal ions
   • D. Covalent bonds

7. 43. Which of the following is an electron-deficient molecule?

   • A. BF3
   • B. NH3
   • C. CH4
   • D. H2O

8. 44. The dipole moment of NH3 is greater than NF3 because:

   • A. Lone pair moment and bond moments are in the same direction in NH3
   • B. Lone pair moment and bond moments are in opposite direction in NH3
   • C. Nitrogen is more electronegative in NH3
   • D. Fluorine is less electronegative than hydrogen

9. 45. Bond order in O2 molecule is:

   • A. 2
   • B. 1
   • C. 1.5
   • D. 2.5

10. 46. The total number of valence electrons in the sulfate ion (SO4^2-) is:

    • A. 32
    • B. 30
    • C. 28
    • D. 26

11. 47. Which of the following is isoelectronic with CO?

    • A. N2
    • B. O2
    • C. CO2
    • D. NO

12. 48. The correct order of bond strength is:

    • A. Triple > Double > Single
    • B. Single > Double > Triple
    • C. Double > Single > Triple
    • D. Double > Triple > Single