The least stable hydride isA. `PH_(3)`B. `AsH_(3)`C. `SbH_(3)`D. `BiH_

1.	The least stable hydride isA. `PH_(3)`B. `AsH_(3)`C. `SbH_(3)`D. `BiH_(3)`
Answer» Correct Answer - 4 The hydrides show regular graduation in their properties ,The thermal stability of the hybrides decreases (due to decrease fo `Delta_("diss")H^(Ɵ)(E-H)]` as we move from `NH_(3)` to `BiH_(3)`. Thus `NH_(3)` is most stable ,the stability of `PH_(3), AsH_(3)` and `SbH_(3)` decreases progrssively while `BiH_(3)` is the least stable. Order of thermal stability: `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3) gt BiH_(3)` `BiH_(3)` is so unstable that it has a half -life of only `20` minutes at ordinary temperatures.

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The least stable hydride isA. `PH_(3)`B. `AsH_(3)`C. `SbH_(3)`D. `BiH_(3)`

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