Which hydride is most stable?

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(C) The stability of alkali metal hydrides decreases down the group as the size of the alkali metal cation increases.As the size of the cation increas

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$LiH$

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(C) The stability of alkali metal hydrides decreases down the group as the size of the alkali metal cation increases.As the size of the cation increases,the lattice energy of the ionic hydride decreases,making it less stable.Among the given options,$Li^+$ has the smallest ionic radius,which results in the highest lattice energy for $LiH$.Therefore,$LiH$ is the most stable hydride among the alkali metal hydrides.

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