Which of the following has highest lattice energy?

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$NaF$

${MgF}_{2}$

${AlF}_{3}$

$NaCl$

answer is A.

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Detailed Solution

The energy needed to transform one mole of an ionic solid into gaseous ionic components is known as lattice energy. The energy that must be provided to one mole of an ionic crystal in order for it to undergo an endothermic process that separates it into gaseous ions may also be used to characterize it.

${AlF}_{3}$ has highest lattice energy.

Hence, option A is correct.

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