Question: Which one of the following combinations cannot function as a buffer solution? H C N and K C N N H 3 and ( N

Which one of the following combinations cannot function as a buffer solution?
HCN and KCN
NH3 and (NH4)2SO4
HNO3 and NaNO3
HF and NaF
HNO2 and NaNO2
Which one of the following combinations cannot function as a buffer

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