The alkali metals from salt like hydride...

The alkali metals from salt like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders ?

A

`LiH gt NaH gt KH gt RbH gt CsH`

B

`CsH gt RbH gt KH gt NaH gt LiH`

C

`KH gt NaH gt LiH gt CsH gt RbH`

D

`NaH gt LiH gt KH gt RbH gt CsH`

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The correct Answer is:

A

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