Conjugate acid and conjugate base of $HCO_3^{-}$ are respectively
- A$H_2CO_3, H_3CO_3^{+}$
- B$H_2CO_3, CO_3^{2-}$
- C$CO_3^{2-}, H_2CO_3$
- D$CO_3^{2-}, CO_2$
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