Solve the following
Question:

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

Solution:

As we move down a group, the atomic size increases and the stability of the hydrides of group 15 elements decreases. Since the stability of hydrides decreases on moving from NH3 to BiH3, the reducing character of the hydrides increases on moving from NH3 to BiH3.

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