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  4. The alkali metals form salt like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?

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Q. The alkali metals form salt like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?

AIPMTAIPMT 2008The s-Block Elements

Solution:

As the size of the alkali metal cation increases, thermal stability of their hydrides decreases. Hence, the correct order of thermal stability of alkali metal hydrides is
$$ LiH > NaH > KH > RbH > CsH