Explain mixtures will be a buffer when dissolved in water

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Which of the following mixtures will be a buffer when dissolved in 1 liter of water?

0.10 mol Ba(OH)2 and 0.20 mol HCl

0.30 mol KCl and 0.30 mol HCl

0.40 mol NH3 and 0.40 mol HCl

0.20 mol HNO2 and 0.10 mol NaOH

0.20 mol HBr and 0.10 mol KOH

Reference no: EM13234714

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