Pure hydrogen is obtained by carrying out the electrolysis of:

The oxidation number of hydrogen in $MH_2$ is

Which of the following substances does not release $O_2$ and removes water vapor?

What do you understand by the terms: $(i)$ hydrogen economy,$(ii)$ hydrogenation,$(iii)$ 'syngas',$(iv)$ water-gas shift reaction,and $(v)$ fuel-cell?

What do you understand by the term "non-stoichiometric hydrides"? Do you expect this type of the hydrides to be formed by alkali metals? Justify your answer.

On passing electric current over molten ionic hydrides of $s-$block elements,