A conjugate acid base pair is an acid and a base that are the same except for an H+, which is option D.
A conjugate base is any compound, of general formula Xn+, which can be transformed into a conjugate acid.
A conjugate acid, on the other hand, is any compound, of general formula HXn+, which can be transformed into a conjugate base X(n-1)+ by the loss of a proton.
This suggests that a conjugate acid base pair is an acid and a base that are the same except for an H+ (proton).
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