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Which of the following pair of solutions...

Which of the following pair of solutions does not form a buffer solution?
(A) `NaH_(2)PO_(4)` and `Na_(2)HPO_(4)`
(B) `H_(2)CO_(3)` and `NaHCO_(3)`
(C) `NH_(4)OH` and `NH_(4)Cl` (D) KOH and `K_(2)SO_(4)`

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