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Q.

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.
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