An acidic buffer is obtained on mixing: [JEE Main 2020, 3 Sep (Shift 1)]

\(100\mathrm{mL}\) of \(0.1\mathrm{MHCI}\) and \(200\mathrm{mL}\) of \(0.1\mathrm{MNaCI}\)

\(100\mathrm{mL}\) of \(0.1\mathrm{MHCl}\) and \(200\mathrm{mL}\) of \(0.1\mathrm{M}\) \({\mathrm{CH}}_{3}\mathrm{COONa}\)

\(100\mathrm{mL}\) of \(0.1{\mathrm{MCH}}_{3}\mathrm{COOH}\) and \(100\mathrm{mL}\) of \(0.1\mathrm{M}\) \(\mathrm{NaOH}\)

\(100\mathrm{mL}\) of \(0.1{\mathrm{MCH}}_{3}\mathrm{COOH}\) and \(200\mathrm{mL}\) of \(0.1\mathrm{M}\) \(\mathrm{NaOH}\)