Question

Which of the following hydride is non-stoichiometric in nature ?

• A. Ammonia
• B. Diborane
• C. Sodium hydride
• D. Nickel hydride.

Answer 1

The correct option is D Nickel hydride.

Interstitial hydrides are also known as metallic hydrides. They are formed when hydrogen molecule react with d and f block metals. These hydrides are non-stoichiometric in nature since a fraction of hydrogen atom are not fixed to the metal. Nickel hydride is an example of interstitial hydride and it is non-stoichiometric in nature.
Ionic and covalent hydrides are stoichiometric nature.
Sodium hydride $\left(NaH\right)$ is ionic hydride.
Ammonia $\left(N{H}_3\right)$ and Diborane $\left(B_2{H}_6\right)$ are covalent hydride.
Hence option (d) is correct