Write the physical properties of $H_2$.

The synonym for water gas when used in the production of methanol is:

Which of the following substances is used as a dehydrating agent in the laboratory?

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.

From which source is the maximum amount of hydrogen obtained?

Hydrogen generally forms covalent compounds. Give reason.