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(A) $KCN$ is a salt of a weak acid $(HCN)$ and a strong base $(KOH)$.When dissolved in water,the $CN^-$ ion undergoes hydrolysis to form $OH^-$ ions,r

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$KCN$

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(A) $KCN$ is a salt of a weak acid $(HCN)$ and a strong base $(KOH)$.When dissolved in water,the $CN^-$ ion undergoes hydrolysis to form $OH^-$ ions,resulting in a basic solution with $pH > 7$ at $25^{\circ} C$.$KNO_3$ is a salt of a strong acid and a strong base $(pH = 7)$.$NH_4Cl$ is a salt of a weak base and a strong acid $(pH $NH_4CN$ is a salt of a weak acid and a weak base $(pH \approx 7)$.

Which one of the following salts on being dissolved in water gives $pH > 7$ at $25^{\circ} C$?

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