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

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NaCl

RbCl

KCl

LiCl

answer is A.

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Detailed Solution

The low melting point of LiCl (887 K) as compared to NaCl is probably because LiCl is covalent in nature and NaCl is ionic.Hence the correct order is NaCl>KCl>CsCl>LiCl.

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