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.

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Solution

In non stoichiometric hydrides, the ratio of the metal to hydrogen is fractional and does not correspond to actual formula. Their composition varies with temperature and pressure. $T i H_{x} (x = 1.8 t o 2)$ and $Z r H_{x} (x = 1.30 t o 1.75)$ are examples of non stoichiometric hydrides. d and f block elements form such types of hydrides.
Alkali metals readily lose their valence electron and act as strong reducing agents. The electrons lost by alkali metals are gained by H to form ionic hydrides in which the ratio of alkali metals to hydrogen is fixed. Hence, alkali metals form only stioichiometric hydrides.

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