Which ionic compound has the smallest lattice energy?

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${MgCl}_{2}$

$NaF$

$Lil$

$MgO$

answer is B.

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Detailed Solution

The energy needed to convert one mole of an ionic solid into gaseous ions is known as lattice energy. Lattice energy cannot be experimentally measured, but it may be inferred using the Born-Haber cycle or computed using electrostatics.

So, $NaF$ ionic compound has the smallest lattice energy.

Hence, option B is correct.

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