Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution?

Question:Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution?

1.0.0002M HCI

2.0.2 mole of NaCI with 0.2 mole of HNO3

3.0.4 mole of CH3COOH with 0.4 mole of NaOH

4.0.4 mole of NH3 with 0.2 mole of HCI


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