A) \[HCOOH+HCO{{O}^{-}}\]
B) \[C{{H}_{3}}COOH+C{{H}_{3}}CO{{O}^{-}}\]
C) \[{{H}_{2}}{{C}_{2}}{{O}_{4}}+{{C}_{2}}O_{4}^{2-}\]
D) \[{{H}_{3}}B{{O}_{3}}+BO_{3}^{3-}\]
Correct Answer: A
Solution :
It is a buffer solution of strong acid and its weak conjugate base.
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