1.

Which among the following is strongest reducing agent?A. `AsH_(3)`B. `BiH_(3)`C. `PH_(3)`D. `SbH_(3)`

Answer» Correct Answer - 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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