Which of the following salts will give highest $p H$ in water?

K C l

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N a C l

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N a_{2} C O_{3}

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C u S O_{4}

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Solution

The correct option is D $N a_{2} C O_{3}$
$N a C l$ and $K C l$ are the salts of a strong acid and strong base. They do not undergo hydrolysis. Their aqueous solutions are neutral.
$N a_{2} C O_{3}$ is basic due to hydrolysis of $C O_{3}^{2 -}$ ion
$C O_{3}^{2 -} + H_{2} O ⇌ H C O_{3}^{-} + O H^{-}$
Hence, $N a_{2} C O_{3}$ will give highest pH in water.

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