The correct order of acidic strength is H2SO4> H2SO3 >HSO^-3.
H2SO4 has a higher oxidation state for S than H2SO3, which is +7 as opposed to +4. Two inorganic acids with sulfur, hydrogen, and oxygen as constituents are sulfuric acid (H2SO4) and sulfurous acid (H2SO3). The more oxidized the center atom is, the more electrons it draws to itself and the more it stabilizes the conjugate base. H2SO4 is a stronger acid as a result. When you consider acids and bases, HSO^-3 operates as a base since it contributes a pair of electrons, which is another definition. A base is a chemical that provides a pair of electrons, as opposed to an acid, which absorbs a pair of electrons.
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