is sulphur dioxide considered as pure substance
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Sulfur dioxide or sulphur dioxide (British English) is the chemical compound with the formula SO
2. It is a toxic gas responsible for the smell of burnt matches. It is released naturally by volcanic activity and is produced as a by-product of copper extraction and the burning of fossil fuels contaminated with sulfur compounds
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Sulfur dioxide, (SO2), inorganic compound, a heavy, colourless, poisonous gas. It is produced in huge quantities in intermediate steps of sulfuric acid manufacture.
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