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Stability order of VA group hydrides is

$\begin{array}{1 1}(a)\;PH_3>AsH_3>BiH_3\\(b)\;NH_3>PH_3>AsH_3>SbH_3>BiH_3\\(c)\;PH_3>NH_3>SbH_3>AsH_3>BiH_3\\(d)\;NH_3>PH_3>AsH_3>BiH_3>SbH_3\end{array}$

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$NH_3$ More stable
$BiH_3$ least stable
Due to tall in M-H bond energy ,stability decreases
Hence (b) is the correct option.
answered Nov 26, 2013 by sreemathi.v
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