A) \[C{{O}_{3}}^{2-}\]
B) \[C{{O}_{2}}\]
C) \[{{H}_{2}}O\]
D) \[{{H}_{2}}C{{O}_{3}}\]
Correct Answer: A
Solution :
Conjugate base of \[HC{{O}_{3}}^{-}\] is \[C{{O}_{3}}^{2-}\]
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