The strongest acid is H2SO4 because it has the more electronegative sulfur atom.
What are acids?
According to the Arrhenius definition, an acid is a substance that produces hydrogen ions in solution as its only positive ion. This definition is somewhat restricted to reaction in aqueous media.
From the list of substances in the question, we can see that the strongest acid here is H2SO4 because it has the more electronegative sulfur atom as well as the highest number of oxygen atoms.
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