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Question

Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH and CsH, the correct order of increasing ionic character is:

A
LiH>NaH>CsH>KH>RbH
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B
LiH<NaH<KH<RbH<CsH
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C
RbH>CsH>NaH>KH>LiH
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D
NaH>CsH>RbH>LiH>KH
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Solution

The correct option is B LiH<NaH<KH<RbH<CsH
Ionic character increases with the size of the cation as we move down the group. As the ionisation enthalpy decreases on moving from top to bottom in a group, the tendency to lose electron by metal increases. Hence ionic character increases.

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