Write the reaction equations S – SO2 – H2SO3

To carry out the above chain of transformations, it is necessary to carry out the following reactions:
Sulfur and oxygen, as a result of the reaction, tetravalent sulfur oxide is obtained

S + O₂ = SO₂
We add water to tetravalent sulfur oxide, and as a result of the reaction, sulfurous acid is formed. This acid is dibasic and not very stable.

SO₂ + H₂O = H₂SO₃



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