The compound having lowest melting point is:

L i C l

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C s C l

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R b C l

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K C l

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Solution

The correct option is D $L i C l$

Among the given alkali metal chlorides, $L i C l$ has the lowest melting point. It is because the lattice energy of alkali metal chlorides decreases as the atomic size of alkali metal increases on going down the group.

Thus, the melting point decreases, but due to the covalent bonding in $L i C l$ , its melting point is lower than $N a C l$ .

Hence, option A is correct.

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