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QAIPMT-2008-Ph-2237: NEET 2008 Chemistry - Class 11 AIPMT-2008-Ph-2237 Solution: The alkali metals form salt-like hydrides by the direct…

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 orders?

Multiple Choice Options

A $NaH>LiH>KH>RbH>CsH$
B $LiH>NaH>KH>RbH>CsH$
C $CsH>RbH>KH>NaH>LiH$
D $KH>NaH>LiH>CsH>RbH$

Step-by-Step Verified Solution

The stability of alkali metal hydrides decreases from Li to Cs. It is due to the fact that M�H bonds becomes weaker with increase in size of alkali metals as we move down the group from Li to Cs. Thus the order of stability of hydrides is LiH > NaH > KH > RbH > CsH

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