It should be obvious that one pair is HSO4^- and SO4^2-
The other pair, not quite so obvious, is OH^- and H2O (HOH). But if you pick out the HSO4^/SO4^2-) you know what's left is the other pair. Most questions of this type don't stop here but want to know which is the acid and which the base. Here is how you tell which is which. The ACID is the one with the extra H. The base is the one with the fewer H.
So for the HSO4/SO4, HSOr must be the acid and SO4 must be the base.
In OH/H2O, the OH has fewer H and the H2O has more H so which is which.
Identify the acid-base pairs in the following reactions HSO4^1-(aq) + OH^1- <==>SO4^2-(aq) + H2)(I)
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