Question

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

• A. $KCl$
• B. $RbCl$
• C. $LiCl$
• D. $NaCl$

Answer 1

The correct option is D $NaCl$

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 the highest melting point.