Question

From group 6 only one metal forms hydride. This metal is:

• A. Mo
• B. W
• C. Cr
• D. Co

Answer 1

Answer: (C)

Cr

The low affinity of the elements of the group $6,7,8$ and $9$ towards hydrogen in their normal oxidation states prevent the formation of hydrides. This is called as hydride gap.

In the group, $6$, Chromium $\left(Cr\right)$ is an exception as it is the only group $6$ element to form a hydride.

Answer: $\left(Cr\right)$