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  4. Which hydride among the following is strongest reducing agent?

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Q. Which hydride among the following is strongest reducing agent?

MHT CETMHT CET 2019

Solution:

Among the given hydrides of group 15 elements, $BiH _{3}$ is the strongest reducing agent. This is because as we move down the group, bond dissociation enthalpy decreases and thus reducing character increases. Hence, the order is

$NH _{3}< PH _{3}< AsH _{3}< SbH _{3}< BiH _{3}$