MCQs on Hybridisation

Hybridisation is the mixing of atomic orbitals (s and p) on a particular atom to produce a new set of orbitals (the same number as originally) that have both s and p character and are better arranged in space for covalent bonding. Hybridisation involving s, p and d orbitals only. The designation for hybrid orbitals in bonding atoms are derived from the designations of the atomic orbitals of the isolated atoms. The number of hybrid orbitals is always the same as the number of atomic orbitals used to form the hybrids. Particular geometries can be related to particular bonding patterns in molecules. These bonding patterns led to the concept of hybridizations, which was derived from a mathematical model of bonding.

1. The compound which contains both ionic and covalent bond:

1. KCl
2. KCN
3. CH₄
4. H₂

Answer: (b)

2. The maximum number of 90^o angles between bond pair-bond pair of electrons is observed in

1. dsp² hybridisation
2. sp³d hybridisation
3. dsp³ hybridisation
4. sp³d² hybridisation

Answer: (d)

3. Ether is more volatile than alcohol having the same molecular formula. This is due to

1. alcohols having resonance structures
2. intermolecular hydrogen bonding in ethers
3. intermolecular hydrogen bonding in alcohols
4. the dipolar character of ethers

Answer: (c)

4. The main axis of a diatomic molecule is z, molecular orbital p_x and p_y overlap to form which of the following orbital?

1. pi molecular orbital
2. sigma molecular orbital
3. gamma molecular orbital
4. No bond will be formed

Answer: (a)

5. Total number of lone pair of electrons in I^3- ion is

1. 3
2. 6
3. 9
4. 12

Answer: (c)

6. BCl₃ is a planar molecule whereas NCl₃ is pyramidal because

1. B-Cl bond is more polar than NaCl bond
2. N-Cl bond is more covalent than B-Cl bond
3. the nitrogen atom is smaller than boron atom
4. BCl₃ has no pair but NCl₃ has a lone pair of electrons

Answer: (d)

7. In which solvent NaCl has maximum solubility?

1. H₂O
2. C₂H₅OH
3. CH₃COCH₃
4. C₂H₅OC₂H₅

Answer: (a)

8. Which one of the following pairs of molecules will have permanent dipole moments for both members?

1. NO₂ and CO₂
2. NO₂ and O₃
3. SiF₄ and CO₂
4. SiF₄ and NO₂

Answer: (b)

9. Which of the following compounds has the smallest bond angle in its molecule?

1. H₂O
2. H₂S
3. NH₃
4. SO₂

Answer: (b)

10. Which one of the following properties is not shown by NO?

1. it is diamagnetic in the gaseous state
2. it is a neutral oxide
3. it combines with oxygen to form nitrogen dioxide
4. its bond order is 2.5

Answer: (a)

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