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Which may be added to one litre of water to act as a buffer

(1) One mole of HC2H3O2 and 0.5 mole of NaOH

(2) One mole of NH4Cl and one mole of HCl

(3) One mole of NH4OH and one mole of NaOH

(4) One mole of HC2HO and one mole of HCl