Which element form Hydride?

$\begin{array}{1 1}(a)\;Cr\\(b)\;Mo\\(c)\;W\\(d)\;Sg\end{array}$

Solution :
In Group 6 only $Cr$ forms the hydride, $CrH$ and $CrH_2$
Hence (a) is the correct answer.
edited Oct 4, 2017 by meena.p