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Why is "BiH"(3) the strongest reducing a...

Why is `"BiH"_(3)` the strongest reducing agent amongst all the hydrides of Group 15 elements ?

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Among the 15 group elements, the size of Bi atom is largest and hence, the Bi-H bond length is largest or Bi-H bond dissociation energy is lowest. That's why Bi-H bond dissociates more readily than the other hydrides of the group and hence, `"BiH"_(3)` is the strongest reducing agent.
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