• # question_answer Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point [AIEEE 2005] A) LiCl B) NaCl C) KCl D) RbCl

Correct Answer: B

Solution :

Although lattice energy of $LiCl$ higher than $NaCl$ but $LiCl$ is covalent in nature and $NaCl$ ionic there after, the melting point decreases as we move $NaCl$ because the lattice energy decreases as a size of alkali metal atom increases (lattice energy $\propto$ melting point of alkali metal halide)

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