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The p-Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe p-Block Elements1 Mark
Question
Why is $BiH_3$ the strongest reducing agent amongst all the hydrides of Group 15 elements?
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Answer

This is because as we move down the group, the size increases, as a result, length of E-H bond increases and its strength decreases, so that the bond can be broken easily to release $H_2$ gas. Hence, $BiH_3$ is the strongest reducing agent.

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