An aqueous solution of $N a_{2} S O_{4}$ has a $p H$ nearly equal to:

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Solution

The correct option is C 7
$N a_{2} S O_{4}$ is a salt of strong acid $H_{2} S O_{4}$ and stong base $N a O H$ . It is completely ionized in solution into $N a^{+}$ ions and $S O_{4}^{2 -}$ ions.

$N a_{2} S O_{4} ⇌ 2 N a^{+} + S O_{4}^{2 -}$

Thus it is not hydrolyzed. Hence, its solution is neutral with pH 7 .

Option A is correct.

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