1.

The least stable hydride of 15th group elements 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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