Which of the following order of melting point is correct

$L i F > L i C 1, N a C 1 > M g O$

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$L i F > L i C 1, N a C 1 < M g O$

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$L i F > L i C 1, N a C 1 < M g O$

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$L i F < L i C 1, N a C 1 > M g O$

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Solution

The correct option is C
$L i F > L i C 1, N a C 1 < M g O$

Lattice energy $\propto | Z^{+} | | Z^{-} |$
$\propto \frac{1}{r^{+} + r^{-}}$

LiF LiC1

Size $F^{-} < C 1^{-}$

Lattice energy $L i F > L i C 1$

$N a C 1 \to N a^{\oplus} + C 1^{-}$
$M g O \to M g^{+ 2} + O^{- 2}$
Lattice energy $M g O > N a C 1$

Charge dominate over size

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