A) \[NaOH+C{{H}_{3}}COONa\]
B) \[NaOH+N{{a}_{2}}S{{O}_{4}}\]
C) \[1\times {{10}^{-4}}\]
D) \[N{{H}_{4}}OH+C{{H}_{3}}COON{{H}_{4}}\]
Correct Answer: D
Solution :
Buffer is mixture of weak base and its acid salt.
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