The correct order of stability of hydrides of alkali metal is :
A
LiH > NaH > KH > RbH
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B
NaH > KH > RbH > LiH
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C
RbH > KH > NaH > LiH
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D
LiH > RbH > KH > NaH
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Solution
The correct option is A LiH > NaH > KH > RbH The stability of hydrides decreases from LiH to CsH in the order LiH > NaH > KH > RbH > CsH. The hydride ion is a small ion. It forms stable compounds with small lithium ion. The stability decreases as the size of cation increases. This decreases the lattice energy of these hydrides.