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Solution

conjugate base is formed after acid loses H+

H₂CO₃ after losing H⁺ forms HCO₃^- ion
So, HCO₃^- is conjugate base of H₂CO₃

HCO₃^- after losing H⁺ forms CO₃^2- ion
So, CO₃^2- is conjugate base of HCO₃^-

NH₄⁺ after losing H⁺ forms NH₃
So, NH₃ is conjugate base of NH₄⁺

Answer:
HCO₃^-
CO₃^2-
NH₃