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  4. Most unstable hydride is

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Q. Most unstable hydride is

J & K CETJ & K CET 2004

Solution:

In $V$ A group the thermal stability of hydrides decreases from $NH _{3}$ to $XeF _{6}$ Hence, $BiH _{3}$ is the most unstable hydride.
$NH _{3}> PH _{3}> AsH _{3}> SbH _{3}> BiH _{3}$