Sulfur dioxide, (SO2), a heavy, colourless, poisonous gas. It is produced in huge quantities in intermediate steps of sulfuric acid manufacture. The overarching, dominant use of sulfur dioxide is in the production of sulfuric acid- .Precursor to sulfuric acid. .Food preservative. .Winemaking .As a reducing agent. .Biochemical and biomedical roles. .As a reagent and solvent in the laboratory.
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