question_answer

The bond angle in water molecule is less than in ammonia molecule, due to the

A)  presence of two lone pairs in \[{{H}_{2}}O\] molecule

B)  presence of three lone pairs in \[{{H}_{2}}O\] molecule

C)  presence of two lone pairs in \[N{{H}_{3}}\] molecule

D)  high electronegativity of oxygen atom

Correct Answer: A

Solution :

The shape of ammonia molecule is trigonal pyramidal due to repulsion between\[lp-bp\] (which is more than \[bp-bp\] repulsion). Thus, the and between the bond pairs in ammonia is reduced to \[{{107}^{o}}\] from\[{{109.5}^{o}}\].