JEE Main 202122 JulyMorning Shift

Exam: JEE Main
Year: 2021
Date: 22 July
Shift: Morning Shift
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2021 · 22 July · Morning Shift · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which one of the following group- 15 hydride is the strongest...

Which one of the following group-

15

hydride is the strongest reducing agent ?

Options

A ${AsH}_{3}$
B ${BiH}_{3}$
C ${PH}_{3}$
D ${SbH}_{3}$

Correct answer

B. ${BiH}_{3}$

Step-by-step solution

When we go down the group, the size of the atom increase also the distance between the metal hydrogen bond increases in hydrides. So, the strength of the metal hydrogen bond decreases. A reducing agent is one that supplies a hydrogen atom. Among ${15}^{th}$ group hydrides, ${BiH}_{3}$ is strongest reducing agent.

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