Metal hydrides are ionic, covalent or molecular in nature. Among LiH,NaH,KH,RbH and CsH, the correct order of increasing ionic character is:
LiH>NaH>CsH>KH>RbH
LiH<NaH<KH<RbH<CsH
RbH>CsH>NaH>KH>LiH
NaH>CsH>RbH>LiH>KH
A
LiH<NaH<KH<RbH<CsH
B
LiH>NaH>CsH>KH>RbH
C
RbH>CsH>NaH>KH>LiH
D
NaH>CsH>RbH>LiH>KH
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Solution
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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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Metal hydrides are ionic, covalent or molecular in nature. Among LiH,NaH, KH,RbH,CsH, the correct order of increasing ionic charcter is
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