JEE Main · 2021 · 16 Mar 2021 · Shift 1 · p-Block Elements

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

(A)Bi✓ Correct
(B)Sb
(C)As
(D)P

Answer: (A)

Solution

Metallic character increases down group 15, and bismuth is the only member of the group that is a true metal.
The central atom also grows larger down the group, so its valence orbital overlaps the small hydrogen

1 s

orbital less effectively and the M-H bond weakens steadily. A weaker M-H bond releases hydrogen more readily, and the reducing power of the hydrides therefore rises in the order

N H_{3} < P H_{3} < As H_{3} < Sb H_{3} < Bi H_{3}

.
The element that is a metal and whose hydride is the strongest reducing agent of the group is bismuth.

JEE Main · 2021 · 16 Mar 2021 · Shift 1 · Single correct option

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