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Question
The correct order of thermal stability of alkali metal hydrides is:
Options:
A .  CsH>RbH>KH>NaH>LiH
B .  LiH>NaH>KH>RbH>CsH
C .  CsH>NaH>KH>RbH>LiH
D .  LiH>KH>NaH>RbH>CsH
Answer: Option B
:
B
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 stabilityof the hydrides decreases.

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