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  4. Which of the following mixtures will act as a buffer solution when dissolved in 50 mL of water ?

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Q. Which of the following mixtures will act as a buffer solution when dissolved in 50 mL of water ?

Equilibrium

Solution:

Aniline and its salt with $HCl$ will act as a buffer solution
$0.2\,mol$ of aniline $+ 0.1 \,mol$ of $HCl$
$=0.1$ mol of aniline hydrochloride $+ 0.1$ mol aniline