JEE Main · 2021 · 25 Jul 2021 · Shift 2 · Hydrogen

Which one of the following metals forms interstitial hydride easily?

(A)Fe
(B)Cr✓ Correct
(C)Mn
(D)Co

Answer: (B)

Solution

An interstitial, or metallic, hydride is formed when hydrogen atoms lodge in the voids of a metal lattice without disturbing it. Among the

d

-block metals this happens up to group 6, while the metals of groups 7, 8 and 9 take up hydrogen so poorly that this stretch of the block is called the hydride gap. Manganese belongs to group 7, iron to group 8 and cobalt to group 9, so all three lie within that gap. Chromium is a group 6 metal standing just outside it and forms the interstitial hydride

CrH

readily.

JEE Main · 2021 · 25 Jul 2021 · Shift 2 · Single correct option

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