Assertion : $C a F_{2}$ is soluble in water but $C a I_{2}$ is not soluble in water. Reason: $C a F_{2}$ is more ionic than $C a I_{2}$ .

Read the above assertion and reason and choose the correct option regarding it.

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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is D Assertion is incorrect but Reason is correct.
Option (D) is correct.
Fluoride is very electronegative, and thus the bonding forces between $C a^{2 +}$ and each fluoride anions are very strong, they are tightly held together in the crystal form. A few water molecules do not have enough strength to get in between and dissolve it. Thus, $C a F_{2}$ is insoluble in water but more ionic, having high lattice energy due to small size of $F^{-}$ .

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