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Sulphur oxides (SOx)

Term
The most common sulphur oxide is sulphur dioxide (SO2). Sulphur trioxide (SO3) is an intermediate product during the manufacture of sulphuric acid (contact process).Sulphur dioxide is a colourless gas with a penetrating, choking odour. It dissolves readily in water to form an acidic solution (sulphurous acid) and is about 2.5 times heavier than air.

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