Why is BiH(3) the strongest reducing age...

Why is `BiH_(3)` the strongest reducing agent amongst all the hydrides of Group-15 elements?

Text Solution

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On moving down a group, with increase in atomic number, the atomic size increases. This leads to increase in E-H bond length and consequent decrease in its bond strength. So, as we move down the group, the E - H bond can break easily evolving `H_(2)` gas which acts as a reducing agent. Thus, amongst all the halogen hydrides, Bi-H bond is the weakest, making it the strongest reducing agent.

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