Question

Assertion : In $N{H}_3,N$ is $s{p}^3$ hybridised but bond angle is $107^{\circ }$.
Reason : Shape of $N{H}_3$ molecule is trigonal pyramidal.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

$N{H}_3$ molecule has three bond pairs and one lone pair of electrons.
Lone pair-bond pair repulsions are greater than bond pair-bond pair repulsions and hence result in deviation from ideal tetrahedral angle $109.5^{\circ }$.