Question

The incorrect order of melting point among the following is

• A. $LiCl>NaCl$
• B. $NaCl>KCl$
• C. $KCl>RbCl$
• D. all of the above

Answer 1

The correct option is B $NaCl>KCl$

Generally melting point of chlorides decreases down the group due to decrease in lattice energy. However, due to the polarization of chloride ion by lithium cation, it has some covalent character. Hence, lithium chloride has the poor melting point than sodium chloride.