1.

Correct order of decreasing thermal stability is

Answer»

`NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)`
`PH_(3) gt NH_(3) gt AsH_(3) gt SbH_(3)`
`AsH_(3) gt PH_(3) gt NH_(3) gt SbH_(3)`
`SbH_(3) gt AsH_(3) gt PH_(3) gt NH_(3)`

Solution :The thermal stability of hydrides of nitrogen family or GROUP 15 elements decreases on moving DOWNWARDS in the group. THEREFORE, `NH_(3)` is the most stable and `BiH_(3)` is the least stable. The stability of the hybrides of group 15 elements decreases in the ORDER : `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3) gt BiH_3`


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