Assertion (A): $L i F$ is the least soluble of all the lithium halides in water
Reason (R) : It is due to its very high lattice energy

Both A and R are true and R is the correct explanation of A

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Both A and R are true but R is not a correct explanation of A

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A is true but R is false

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Both A and R are false

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Solution

The correct option is C Both A and R are true and R is the correct explanation of A
Small lithium ion combines with small fluoride ion to form $L i F$ molecule.This results in high lattice energy of lithium fluoride molecule. With increase in the lattice energy, the solubility decreases. Hence $L i F$ is the least soluble of all the lithium halides in water.

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