Which one of the following metals forms interstitial hydride easily?

The product$(s)$ of the reaction $NaBH_4 + I_2 \longrightarrow$ 'Products' is/are

Discuss the position of hydrogen in the modern periodic table.

How can $D_2O$ be prepared from water? Mention the physical properties in which $D_2O$ differs from $H_2O$. Give at least three reactions of $D_2O$ showing the exchange of hydrogen with deuterium.

Metals of groups $7$,$8$,and $9$ do not form metallic hydrides. This is termed as

Write a short note on Ionic or Saline Hydrides.