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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

NaHgtLiHgtKHgtRbHgtCsH

B

LiHgtNaHgtKHgtRbHgtCsH

C

CsHgtRbHgtKHgtNaHgtLiH

D

KHgtNaHgtLiHgtCsHgtRbH

Text Solution

Verified by Experts

The correct Answer is:
B
The ionic character of the bonds in hydrides increase from LiH to CsH so thermal stability of these hydrides decreases as follows :
LiH gt NaH gt KH gt RbH gt CsH
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