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Q. Which of the following is not a conjugate acid-base pair?

ManipalManipal 2012Equilibrium

Solution:

$ Aci{{d}_{1}}+Bas{{e}_{2}} \rightleftharpoons Aci{{d}_{2}}+Bas{{e}_{1}} $
$ HPO_{3}^{2-}+{{H}_{2}}O \rightleftharpoons {{H}_{3}}{{O}^{+}}+PO_{3}^{3-} $
$ {{H}_{2}}PO_{4}^{-}+{{H}_{2}}O \rightleftharpoons {{H}_{3}}{{O}^{+}}+HPO_{4}^{2-} $
$ {{H}_{3}}P{{O}_{4}}+{{H}_{2}}O \rightleftharpoons {{H}_{3}}{{O}^{+}}+{{H}_{2}}PO_{4}^{-} $