17) What is the procedure to obtain different gases from air?
18) How is fog different from smoke?
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Explanation:
Fog: Droplets of water vapour suspended in the air near the ground. An atmosphere in which visibility is reduced because of a cloud of some substance. Non-pollutant.
Smoke: A hot vapour containing fine particles of carbon being produced by combustion. A cloud of fine particles suspended in a gas. Highly pollutant.
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