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NEET levelSingle correct optionDifficulty 1 of 3ia092

Which of the following mixtures (equal volumes of $0.1 M$ solutions) forms an acidic buffer?

A $NaOH$ and $NaCl$
B $CH X_{3} COOH$ and $CH X_{3} COONa$
C $NH X_{3}$ and $NH X_{4} Cl$
D $HCl$ and $NaCl$

Answer: B

An acidic buffer contains a weak acid and its salt with a strong base:

CH X_{3} COOH / CH X_{3} COONa

.

HCl

and

NaOH

are strong and

NaCl

is neutral, so those pairs cannot resist pH change;

NH X_{3} / NH X_{4} Cl

is a basic buffer.

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