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Sulfur dioxide, SO2, is a colourless gas or liquid that has a strong, odorous smell. It is derived from the burning of fossil fuels (coal and oil) and the smelting of sulphur-containing mineral ores (aluminium, copper, zinccolourless gas, lead and iron).

Carbon dioxide, a colorless gas having a faint sharp odor and a sour taste. It is a greenhouse gas, but it is a minor component of Earth’s atmosphere, formed in combustion of carbon-containing materials, in fermentation, in respiration of animals, and employed by plants in the photosynthesis of carbohydrates.

Carbon dioxide appears as a colorless odorless gas at atmospheric temperatures and pressures. colourless gasRelatively nontoxic and noncombustible. Heavier than air and may asphyxiate by the displacement of air.

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