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How many of the following may act as buffer ? (a) `20mL 0.2 M -H_(2)CO_(3)` solution `+10 ml 0.2 M-NaOH` solution (b) `20 ml 0.2 M -H_(2)CO_(3)` solution `+20 ml 0.2 M-NaOH` solution (c) `20 mL 0.2 M-H_(2)CO_(3)` solution `+30 mL 0.2 M-NaOH` solution (d) `20 mL 0.2 M - H_(2)CO_(3)` solution `+10 mL 0.2 M-NaHCO_(3)` solution (e) `20 mL 0.2 M -H_(2)CO_(3)` solution `+10 mL 0.2 M-Na_(2)CO_(3)` solution (f) `20 mL 0.2 M -H_(2)CO_(3)` solution `+20 mL 0.2 M -Na_(2)CO_(3)` solution (g) `20 mL 0.2 M -H_(2)CO_(3)` solution `+30 ml 0.2 M-Na_(2)CO_(3)` solution

Answer» Correct Answer - 5


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