Question: Which pair of aqueous solutions can create a buffer solution if present in appropriate concentrations? HNO2 and LiOH H3PO4 and Na2HPO4 H2SO4 and NaOH HCN

Which pair of aqueous solutions can create a buffer solution if present in appropriate concentrations? HNO2 and LiOH H3PO4 and Na2HPO4 H2SO4 and NaOH HCN and HCl

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