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Lattice Energy

Arrange NaF, ...

Question

Arrange $N a F, M g F_{2}$ and $A l F_{3}$ in the increasing order of their lattice energies.

A

A l F_{3} < N a F < M g F_{2}

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B

N a F < A l F_{3} < M g F_{2}

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C

N a F < M g F_{2} < A l F_{3}

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D

A l F_{3} < M g F_{2} < N a F

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Solution

The correct option is C $N a F < M g F_{2} < A l F_{3}$
Lattice energy is directly proportional to the product of charges on ions.
Here, $F^{-}$ anion is same in all the compounds.

The corresponding cations are $N a^{+ 1}, M g^{+ 2}, A l^{+ 3}$

So, the lattice energy follows the order: $N a F < M g F_{2} < A l F_{3}$

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