A salt whose aqueous solution will have a pH of more than 7 will be :

(a) $K_{2} C O_{3}$

(b) $K_{2} S O_{4}$

(c) $N a C l$

(d) $N H_{4} C l$

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Solution

(a) $K_{2} C O_{3}$

$K_{2} C O_{3}$ is formed from a weak acid, carbonic acid ( $H_{2} C O_{3}$ ), and a strong base, potassium hydroxide (KOH). On hydrolysis, $K_{2} C O_{3}$ forms more $O H^{-}$ ions than $H^{+}$ ions. Thus, it is basic, with a pH more than 7.

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