• # question_answer 102)   Assertion (A) : Though the central atom of both $N{{H}_{3}}$ and ${{H}_{2}}O$molecules are $s{{p}^{3}}$ -hybridised. Yet H-N-H bond angle is greater than that of H-O-H. Reason (R) : This is because nitrogen atom has one lone pair and oxygen atom has two lone pairs.

(a)  ${{H}_{2}}O$has two lone pairs while $N{{H}_{3}}$ has single lone pair hence ${{H}_{2}}O$ involves greater lone pair-bond pair repulsion.