JEE Main · 2024 · 01 Feb 2024 · Shift 2 · p-Block Elements

The strongest reducing agent amont the following is:

(A) $NH_{3}$
(B) $SbH_{3}$
(C) $BiH_{3}$ ✓ Correct
(D) $PH_{3}$

Answer: (C)

Solution

Down group 15, the E–H bond dissociation enthalpy of the hydrides falls steadily:

N H_{3} > P H_{3} > A s H_{3} > S b H_{3} > B i H_{3}

. A weaker E–H bond breaks more readily to release hydrogen and donate electrons, so reducing power increases down the group.

B i H_{3}

, with the weakest Bi–H bond and the lowest thermal stability among these hydrides, is the strongest reducing agent.

JEE Main · 2024 · 01 Feb 2024 · Shift 2 · Single correct option

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