Which of the following solutions can act as buffer

Which of the following solutions can act as buffer

A
$0.1$ molar aq. $NaCl$
B
$0.1$ molar aq. ${CH}_{3} COOH + 0.1$ molar $NaOH$
C
$0.1$ molar aq. ammonium acetate
D
None of the above

Solution:

${CH}_{3} {COONH}_{4}$ is a simple buffer and called salt of weak acid and weak base.

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