Sulfur dioxide

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Formula: SO2

Sulfur dioxide is a dense colourless gas with a pungent smell. It is corrosive to organic materials and dissolves in water to form sulfurous acid, H2SO3. Sulfur dioxide is used in bleaching, as a chemical reagent and a food preservative. It may be produced by reaction of sulfur with oxygen and during the roasting of sulfide ores.

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