Arrange the following in increasing order of solubility in $H_{2} O$ .

$M g F_{2}, C a F_{2}, A g F$

C a F_{2} < M g F_{2} < A g F

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M g F_{2} < C a F_{2} < A g F

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C a F_{2} < A g F_{2} < M g F

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None of these

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Solution

The correct option is B $M g F_{2} < C a F_{2} < A g F$
The compound which have high lattice energy are less soluble in water.
the order of lattice energy in the following compounds $A g F < C a F_{2} < M g F_{2}$
hence, the increasing order of solubility becomes $M g F_{2} < C a F_{2} < A g F$

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