Out of the following, which pair of solutions is not a buffer solution

1.	Out of the following, which pair of solutions is not a buffer solution
A.	\[N{{H}_{4}}Cl+N{{H}_{4}}OH\]
B.	\[NaCl+NaOH\]
C.	\[N{{a}_{2}}HP{{O}_{4}}+N{{a}_{3}}P{{O}_{4}}\]
D.	\[C{{H}_{3}}COOH+C{{H}_{3}}COONa\]
Answer» C. \[N{{a}_{2}}HP{{O}_{4}}+N{{a}_{3}}P{{O}_{4}}\]

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Out of the following, which pair of solutions is not a buffer solution

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