Which pair is not correct order of lattice energy?

K C I > M g O

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A l N > M g O

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B e C O_{3} > M g C O_{3}

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K C I < M g O

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Solution

The correct option is D $K C I > M g O$
Lattice Energy is directly proportional to the charge on the ions and inversely proportional the size of the ions. As size decreases, lattice energy increases. So $M g O$ have higher lattice energy than $K C l$ .

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