# Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point? Option 1) $LiCl$ Option 2) $NaCl$ Option 3) $KCl$ Option 4) $RbCl$

As we learnt in

Alkali Metal -

Each period starts with an alkali metal whose outermost electronic configuration is ns1

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Despite the fact that $LiCl$ has higher lattice energy than $NaCl$,  $LiCl$ has lower melting point because of its covalent nature. Also, as we go down the group's lattice energy generally decreases as size of alkali metal atom increases.

Option 1)

$LiCl$

This option is incorrect.

Option 2)

$NaCl$

This option is correct.

Option 3)

$KCl$

This option is incorrect.

Option 4)

$RbCl$

This option is incorrect.

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