CBSE Class 12 Chemistry 2022 Term 1 Paper

Question : 34 of 55

Marks: +1, -0

Which of the following is the weakest reducing agent in group 15?

${\NH}_3$
${\PH}_3$
${\AsH}_3$
${\BiH}_3$

Solution:

In group 15th element Hydrides have reducing character. The reducing character of Hydrides increases from Top to bottom. because the Z-H bond strength (Z = N,P, As, Bi) decreases down the group because of increase in the size of central atom. Hence, NH3 is weak reducing agent.

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