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Which among the following is strongest r...

Which among the following is strongest reducing agent?

A

`AsH_(3)`

B

`BiH_(3)`

C

`PH_(3)`

D

`SbH_(3)`

Text Solution

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The correct Answer is:
B
Among the given hydrides of group 15 elements, `BiH_(3)` is the strongest reducing agent. This is because as we move down the group, bond dissociation enthalpy decreases and thus reducing character increases.
Hence, the order is
`NH_(3)ltPH_(3)ltAsH_(3)ltSbH_(3)ltBiH_(3)`
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