Which of the following is not a conjugate aci | vedclass

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(D) conjugate acid-base pair differs by only one proton $(H^+)$.$1.$ $HPO_3^{2-}$ and $PO_3^{3-}$ differ by one $H^+$,so they form a conjugate pair.$2

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$H_2PO_4^{-}, PO_3^{3-}$

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(D) conjugate acid-base pair differs by only one proton $(H^+)$.$1.$ $HPO_3^{2-}$ and $PO_3^{3-}$ differ by one $H^+$,so they form a conjugate pair.$2.$ $H_2PO_4^{-}$ and $HPO_4^{2-}$ differ by one $H^+$,so they form a conjugate pair.$3.$ $H_3PO_4$ and $H_2PO_4^{-}$ differ by one $H^+$,so they form a conjugate pair.$4.$ $H_2PO_4^{-}$ and $PO_3^{3-}$ differ by two protons $(2H^+)$,therefore they do not form a conjugate acid-base pair.

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

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