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Question

The correct order of thermal stability of alkali metal hydrides is:


  1. CsH>RbH> KH >NaH>LiH

  2. LiH>NaH> KH >RbH>CsH

  3. CsH>NaH> KH >RbH>LiH

  4. LiH> KH >NaH>RbH>CsH


Solution

The correct option is B

LiH>NaH> KH >RbH>CsH


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 stability of the hydrides decreases. 

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