Question

any chem expert plz give ans
give reason why
i) the basicity of hydrides of 15 group elements decreases from NH3 to BiH3.
ii) the bond angle of hydrides of 15 group elements decreases from NH3 to BiH3.
iii) ammonia is a good complexing agent.​

Answer 1

Answer:

The hydrides of nitrogen family have one lone pair of electrons on their central atom. Therefore,they act as Lewis bases.As we go done the group, the basic character of these hydrides decreases. Nitrogen atom has the smallest size among the hydrides.Therefore the lone pair is concentrated on a small region and electron density on it is the maximum.Consequently, its electron releasing tendency is maximum.As the size of the central atom increases down the family, the electron density also decreases. As a result, the electron donating capacity or the basic strength decreases down the group.