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Choose the solid with the highest lattice energy.

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$Be (OH)_{2}$

$Mg (OH)_{2}$

$Ca (OH)_{2}$

$Ba (OH)_{2}$

answer is A.

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Detailed Solution

The lattice energy is inversely proportional to the size of cation and anion. Among the given compounds, the size of cation and anion is smallest for LiF. Hence, it has maximum lattice energy.

Lattice energy can be defined as the energy required to convert one mole of an ionic solid into gaseous ionic constituents

Because of the small size of ${Be}^{2 +}$ ions, the ${Be}^{2 +}$ and ${OH}^{-}$ are more tightly held in the crystal.

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