What do you understand by the term 'non-stoichiometric hydrides' ? Do you expect this type of 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.