The correct order of thermal stability of alkali metal hydrides is:

$C s H > R b H > K H > N a H > L i H$

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$L i H > N a H > K H > R b H > C s H$

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$C s H > N a H > K H > R b H > L i H$

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$L i H > K H > N a H > R b H > C s H$

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Solution

The correct option is B
$L i H > N a H > K H > R b H > C s H$

The stability of alkali metal hydrides decreases with increase in the size of the metal cation. In other words, as we go down the group - the stability of the hydrides decreases.

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The correct order of thermal stability of alkali metal hydrides

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