1.

The least stable hydride of 15^(th) group element is

Answer»

`NH_(3)`
`PH_(3)`
`AsH_(3)`
`BiH_(3)`

Solution :As we move from `NH_(3)` to `BiH_(3)`, SIZE of the CENTRAL ATOM increases and its tendency to form COVALENT bond with COMPARATIVELY small H-atom decreases. Hence, stability decreases down the group.


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