Sulfur-dioxide meaning

A colorless, extremely irritating gas or liquid, SO2 , used in many industrial processes, especially in the manufacture of sulfuric acid, and as a preservative, disinfectant, and bleach. It is also a hazardous pollutant resulting from burning fossil fuels and refining sulfide-containing ores.
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A heavy, colorless, suffocating gas, SO2, easily liquefied and used as a bleach, disinfectant, preservative, etc.
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A colorless, poisonous gas or liquid with a strong odor. It is formed naturally by volcanic activity, and is a waste gas produced by burning coal and oil and by many industrial processes, such as smelting. It is also a hazardous air pollutant and a major contributor to acid rain. Chemical formula: SO2.
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(inorganic chemistry) A toxic gas, of molecular formula SO2 that is found in the emissions of volcanos and those of burning coal or petroleum; dissolves in water to form sulfurous acid and, in the presence of oxygen, sulfuric acid, and is thus responsible for acid rain.
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