The aqueous solution of which of the following salts has pH less than 7 at 298 K?

Answer: D

NH X_{4} Cl

is the salt of a strong acid and a weak base;

NH X_{4} X^{+}

hydrolyses as

NH X_{4} X^{+} + H X_{2} O NH X_{3} + H X_{3} O X^{+}

and makes the solution acidic.

CH X_{3} COONa

and

Na X_{2} CO X_{3}

are basic, while

KNO X_{3}

(strong acid, strong base) is neutral.

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