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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 termal stability of these hydrides decreases in which of the following orders ?

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 CsH gt RbH`

Text Solution

Verified by Experts

The correct Answer is:
B
As the size of alkali metal ion increases , lattice enthalpy decreases and hence the stability of the corresponding metal hydride decreases . Thus , option (b) is correct
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