Question

A very large volume of hydrogen can be accommodated by making

• A. non-metallic hydrides.
• B. hydrogen peroxide.
• C. non-stoichiometric hydrides.
• D. alkali metal hydrides.

Answer 1

Answer: (C)

non-stoichiometric hydrides.

Non- stoichiometric hydrides are formed by many d-block and f-block

elements. they are almost always nonstoichiometric, being deficient in hydrogen.

For example, $La{H}_{2.87}$ , $Yb{H}_{2.55}$, $Ti{H}_{1.5–1.8}$, $Zr{H}_{1.3–1.75}$, $V{H}_{0.56}$, $Ni{H}_{0.6–0.7}$, $Pd{H}_{0.6–0.8}$ etc.

In such hydrides, the law of constant composition does not hold good.

The property of absorption of hydrogen on transition metals is widely used in catalytic reduction/hydrogenation reactions for the preparation of a large number of compounds.

Some of the metals (e.g., Pd, Pt) can accommodate a very large volume of hydrogen and, therefore, can be used as its storage media. This property has a high potential for hydrogen storage and as a source of energy.

Hence, the correct option is C