A very large volume of hydrogen can be accommodated by making
non-metallic hydrides.
hydrogen peroxide.
non-stoichiometric hydrides.
alkali metal hydrides.
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This question was previously asked in
UPSC NDA-2 – 2019
Certain transition metals (like palladium, titanium, vanadium, etc.) and their alloys can absorb large volumes of hydrogen, forming interstitial (non-stoichiometric) hydrides. In these hydrides, hydrogen atoms occupy interstitial sites within the metal lattice. This property is exploited for hydrogen storage, as these materials can store hydrogen at densities comparable to or even greater than liquid hydrogen, but at less extreme conditions.