Question

Give reasons

(i) Ammonia is a good complexing agent.

(ii) In group 15 elements ,the bond angle H-M-H decreases in the following order

NH₃(107.8^o),

PH₃ (93.6^o), AsH₃ (91.8^o).

Answer 1

(i) Ammonia has a lone pair of electron therefore it is a good complexing agent.

(ii) With the increase in the size of group 15 element as bond length increases the bond pair-bond pair repulsion decreases. Therefore the angle H-M-H decreases from NH₃ to AsH₃ .