A) \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\]
B) \[HCOOH+HCOOK\]
C) \[C{{H}_{3}}COON{{H}_{4}}\]
D) \[N{{H}_{4}}OH+N{{H}_{4}}Cl\]
Correct Answer: D
Solution :
The pH value of basic buffer solutions is always greater than 7. Among the given, only \[N{{H}_{4}}OH+N{{H}_{4}}Cl\]constitutes the basic buffer (a mixture of weak base and its conjugated salt), thus, has pH greater than 7.
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