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.

Explanation

Transition metals can form hydrides with variable compositions known as non-stoichiometric hydrides e.g., `NiH_(0.6 - 0.7), TiH_(1.5 - 1.8)` etc.