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NEET levelSingle correct optionDifficulty 1 of 3ia001

Which of the following salts gives an acidic aqueous solution at 298 K?

A $NH X_{4} Cl$
B $NaCl$
C $CH X_{3} COONa$
D $KNO X_{3}$

Answer: A

NH X_{4} Cl

is the salt of a strong acid (HCl) and a weak base (

NH X_{3}

). The cation hydrolyses:

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

, so the solution is acidic.

NaCl

and

KNO X_{3}

are neutral and

CH X_{3} COONa

is basic.

Practice Ionic Equilibrium II More on Salt hydrolysis: pH of salts of weak acid or weak base

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