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The alkali metals form salt like hydride...

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

A

`NaH gt LiH gt KH gt RbH gt CsH`

B

`LiH gt NaH gt KH gt RbH gt CsH`

C

`CsH gt RbH gt KH gt NaH gt LiH`

D

`KH gt NaH gt LiH gt CaH gt RbH`

Text Solution

Verified by Experts

The correct Answer is:
B
As bond length increase bond energy decreases their by thermal stability decreases down the group
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