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**Molecular formula:** SO₂
**Molar mass:** 64,065 g/mol
**Information:** Sulfur dioxide is a colourless toxic gas with a pungent smell. It is heavier than air. It has reduction effects.
**Use:** It is the basic raw material for the production of sulfuric acid. It has antiseptic and bleaching properties. It is used to disseminate barrels.
**Appearance:** It occurs in volcanic gases.
