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Question

Which ionic hydride is stable upto its melting point?


A
NaH
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B
CaH2
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C
LiH
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D
BaH2
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Solution

The correct option is C $$LiH$$
All ionic hydrides of group $$I$$ and group $$II$$ decompose before their melting point except $$LiH$$.
$$LiH$$ is stable upto its melting point.
The ionic character of the bonds in hydrides increases from $$LiH$$ to $$CsH$$ and their stability decreases in the same order.

Chemistry

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