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sulphur dioxide

a colourless soluble pungent gas produced by burning sulphur. It is both an oxidizing and a reducing agent and is used in the manufacture of sulphuric acid, the preservation of a wide range of foodstuffs (E220), bleaching, and disinfecting. Formula: SO2 Systematic name sulphur(IV) oxide
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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