Question

Why does SO2 and water make H2SO3 and NOT H2SO4?​

Answer 1

Answer:

SO2 + 0.5O2 + CaO CaSO4 (1) However, the use of gypsum has been limited in recent years. Therefore, in civilized countries, gypsum formed by this process is treated as an industrial waste. Sulfur dioxide is oxidized into sulfuric acid over an activated carbon catalyst in the presence of water2).

Explanation:

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Answer 2

So this is a redox reaction (the oxygen is reduced). ... C: The SO2 has the S in the +4 state and the O in the -2 state. The H2SO3 has the S also in the +4 state since the SO3 anion must have a -2 charge. So nothing is oxidized, therefore it is not a redox reaction.