The lattice energies of $K F, K C l, K B r$ and $K I$ follows the order:

K F > K C l > K B r > K I

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K I > K B r > K C L > K F

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K F > K C l > K I > B r

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K I > K B r > K F > K C l

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Solution

The correct option is A $K F > K C l > K B r > K I$
Lattice energy is directly proportional to the charge of the ions and inversely proportional to the size of the ions. Thus lattice energy increases as the size of anion decreases.

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