Which ionic hydride is stable upto its melting point?

N a H

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C a H_{2}

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L i H

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B a H_{2}

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Solution

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

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Question 3

Metal hydrides are ionic, covalent or molecular in nature. Among LiH,NaH, KH,RbH,CsH, the correct order of increasing ionic charcter is

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