Which of the following solutions cannot act as a buffer [EAMCET 1998]

1.	Which of the following solutions cannot act as a buffer [EAMCET 1998]
A.	\[Na{{H}_{2}}P{{O}_{4}}+{{H}_{3}}P{{O}_{4}}\]
B.	\[C{{H}_{3}}COOH+C{{H}_{3}}COONa\]
C.	\[HCl+N{{H}_{4}}Cl\]
D.	\[{{H}_{3}}P{{O}_{4}}+N{{a}_{2}}HP{{O}_{4}}\]
Answer» D. \[{{H}_{3}}P{{O}_{4}}+N{{a}_{2}}HP{{O}_{4}}\]

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