The alkali metals form salt-like hydrides by | vedclass

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(D) The thermal stability of alkali metal hydrides depends on the strength of the $M-H$ bond.As we move down the group from $Li$ to $Cs$,the size of t

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$LiH > NaH > KH > RbH > CsH$

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(D) The thermal stability of alkali metal hydrides depends on the strength of the $M-H$ bond.As we move down the group from $Li$ to $Cs$,the size of the alkali metal cation increases.This increase in size leads to a decrease in the overlap between the metal orbital and the hydrogen $1s$ orbital,making the $M-H$ bond weaker.Therefore,the thermal stability decreases as the size of the metal increases.The correct order of stability is $LiH > NaH > KH > RbH > CsH$.Thus,option $(D)$ is the correct answer.

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

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