Which of the following compounds has the highest pH in a 0.1M aqueous solution?

K_{2} S O_{4}

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M g C l_{2}

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N a_{2} C_{2} O_{4}

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N H_{4} C l

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Solution

The correct option is D $N a_{2} C_{2} O_{4}$
Salt of a weak acid and strong base will have the highest $p H$ .
Among the given salts, $K_{2} S O_{4}$ and $M g C l_{2}$ are the salts of strong acid and strong base, and $N H_{4} C l$ is salt of strong acid and weak base.
$N a_{2} C_{2} O_{4}$ is a salt of the strong base $N a O H$ and weak acid $H_{2} C_{2} O_{4}$ , so it is a basic salt having pH more than 7.
$C_{2} O_{4}^{2 -} + 2 H_{2} O \to H_{2} C_{2} O_{4} + 2 O H^{-}$
$∴$ Solution will be basic.

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{N H}_{4} C l

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