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  4. A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is :

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Q. A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is :

JEE MainJEE Main 2021The p-Block Elements - Part2

Solution:

In group $15$
image
Hydrides of group 15 elements are $NH _{3}$
$PH _{3}$
$AsH _{3}$
$SbH _{3}$
$BiH _{3}$
In $NH _{3}$, hydrogen atom gets partial positive charge due to less electronegativity.

But in $BiH _{3}$, hydrogen atom gets partial negative charge because hydrogen is more electronegative than bismuth.

i.e. $BiH _{3}$ is a strong reducing agent than others because we know that $H ^{-}$ is a strong reducing agent.