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Solubility

Let the solub...

Question

Let the solubility of an aqueous solution of $M g (O H)_{2}$ be $x$ then its $K_{s p}$ is

4x³

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108x⁵

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27x⁴

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Solution

The correct option is A
4x³

$M g (O H)_{2} ⇋ M g^{2 +} + 2 O H^{-}$
At equilibrium, $[M g^{2 +}] = x, [O H^{-}] = 2 x$
$K_{s p} = 4 x^{3}$

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