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.
