Determine the molar solubility of $M g F_{2}$ from its solubility product $K_{s p} = 4 \times 10^{- 9} .$

10^{- 3}

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6.32 \times 10^{- 5}

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2 \times 10^{- 5}

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None of these

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Solution

The correct option is A $10^{- 3}$

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