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

(a) 0.2 mol of aniline + 0.2 mol of HCl

(b) 0.2 mol of aniline + 0.4 mol of NaOH

(c) 0.2 mol of NaCl + 0.1 mol of HCl

(d) 0.2 mol of aniline + 0.1 mol of HCl

Answer: 0.2 mol of aniline + 0.1 mol of HCl

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