Which of the following compound is not soluble in water?

LiF

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NaCl

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NaBr

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LiBr

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Solution

The correct option is C LiF
Due to its low hydration energy and partial covalent and partial ionic character LiCl is soluble in water as well as acetone. In Lithium fluoride the lattice enthalpy is very high due to small size of fluoride ions. In this case the hydration enthalpy is very less. Hence, LiF is insoluble in water.

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