Which among the following is least soluble?

LiF

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NaF

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RbF

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Solution

The correct option is A
LiF

Li ions has the highest energy of hydration as it is small in size in comparison to other alkali metal ions and thus it should have high solubility. However, the small $L i^{+}$ and $F^{-}$ ions interact very strongly resulting in high lattice energy of LiF which is responsible for its insolubility.

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