Chemistry
Define the following terms:
(a) Pollutants
(b) Acid rain
(c) Global warming
(d) Smog
Air
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Answer
(a) Pollutants are the undesirable substances present in air that are harmful to plants and animals.
(b) A rain which is acidic in nature is called acid rain. Gases like sulphur dioxide, nitrogen dioxide etc. react with water present in air to form sulfurous acid, sulfuric acid, nitrous acid and nitric acid respectively that comes down to earth with rain water in form of acid rain.
(c) An increase in the percentage of carbon dioxide, methane, nitrous oxide and chlorofluorocarbons traps the heat causing the temperature of the earth and its surroundings to rise. This is known as global warming.
(d) Oxides of nitrogen form a mixture of smoke and fog known as smog which affects our eyes too.
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