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Question

Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point

A
Licl
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B
NaCl
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C
KCL
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D
RbCl
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Solution

The correct option is B NaCl
Melting point decreases on going down the group because lattice enthalpy decreases with increase in size of the alkali metal . But due to covalent character of LiCl, its melting point is minimum and hence NaCl has highest melting point.

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