Assertion : $L i F$ has more covalent character than $C s F$ . Reason: Lattice energy of $C s F$ is less than that of $L i F$ .

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
We know, greater the electronegativity difference, greater is the ionic character. Here the electronegativity difference of $C s F > L i F$ . Therefore $C s F$ having more of ionic character and thus $L i F$ have more of covalent character.
Lattice energy of $C s F$ is less than $L i F$ because the size of $L i$ ions are less than $C s$ so it would require more lattice energy to separate.

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Assertion :LiF has more covalent character than CsF. Reason: Lattice energy of CsF is less than that of LiF.

Assertion : $L i F$ has more covalent character than $C s F$ . Reason: Lattice energy of $C s F$ is less than that of $L i F$ .