JEE Main Chemistry question
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point?
Answer: (C)
Solution
Melting point of an ionic solid depends on the balance of lattice energy and the covalent character introduced by cation polarising power. LiCl, despite the smallest cation, has appreciable covalent character (Fajans' rule) which lowers its melting point,
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