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Why is BiH3 the strongest reducing agent amongst all the hydrides of Group 15 elements?

 7.2     Why is BiH_{3}  the strongest reducing agent amongst all the hydrides of Group 15 elements ?

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We see that the stability of hydrides becomes lesser as we go from NH_3  to BiH_3 .this can be seen from dissociation enthalpy of their bond. due to that, the reducing character of the hydrides will be more. Ammonia is only a very mild reducing agent while BiH_3 is the strongest reducing agent amongst all of the hydrides.

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