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what do you understand by “Non stoichiometric hydrides”? Do you think this type of hydrides to be formed by alkali metals? Justify your answer.

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Hydrides which are deficient in hydrogen and in which the ratio of hydrogen to metal is fractional are called non-stoichiometric hydrides. This type of hydrides are formed by d-and f-block element.

Since alkali metals are highly reducing, they transfer their own electron to H atom thereby forming H- ion. Therefore the ratio of metal to hydrogen is always fixed and they form only stoichiometric hydrides. In other words alkali metals do not form non-stoichiometric hydrides.

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