The conjugate bases for $HCO_3^-$ and $NH_3$,respectively,are
- A$H_2CO_3$ and $NH_4^+$
- B$CO_3^{2-}$ and $NH_2^-$
- C$H_2CO_3$ and $NH_2^-$
- D$CO_3^{2-}$ and $NH_4^+$
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