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Question: The basic strength of the hydrides of group 15 elements :...

The basic strength of the hydrides of group 15 elements :

A

Decreases on moving down the group

B

Increases on moving down the group

C

First decreases upto AsH3 and then increases

D

First increases upto AsH3 and then decreases

Answer

Decreases on moving down the group

Explanation

Solution

The basic strength of the hydrides of group 15 elements down the group decreases because down the group as electronegativity decreases p-orbital take part in the bond and lone pair present in s-orbital :

s-orbital is larger and non directional hence it has less effective tendency of bond formation.