Assertion : $C s I$ is insoluble in water. Reason: Hydration energy of $C s^{+}$ and $I^{-}$ ions are higher than lattice energy.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
In CsI, the constituent ions are $C s^{+}$ and $I^{-}$ . Both these ions are large in size, as a result of which their hydration enthalpy is small. As hydration enthalpy is lower than lattice energy thats why CsI is insoluble in water.

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