Reducing power of VA -group hydrides are in order:
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a
NH3>PH3>AsH3>SbH3>BiH3
b
BiH3>SbH3>AsH3>PH3>NH3
c
PH3>NH3>AsH3>SbH3>BiH3
d
BiH3>SbH3>AsH3>NH3>PH3
answer is B.
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Detailed Solution
The M-H bond energy depends mainly on the atomic size of M, since Bi has highest atomic size the overlap of Bi-H bond is weakest and the hydride ion is lost very easily.