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How is SO_2 an air pollutant ? |
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Answer» Solution :(i) `SO_2` is STRONGLY irritating to the respiratory tract. `SO_2` at a concentration of 5 ppm causes throat and eye irritation CAUSING cough, tears and redness in eyes. It causes breathlessness and affects larynx, i.e., voice box. (ii) Even at low concentration, it has a damaging effect on the plants. If exposed for a long time, it slows down the formation of chlorophyll resulting in injury to the LEAVES INCLUDING loss of green colour. This is called chlorosis. (iii) SO, dissolves in rain water and produces acid rain which damages building materials especially MARBLE `(CaCO_3)` `CaCO_3 + H_2SO_3 to CaSO_3 + H_2O + CO_2 ` (iv) It corrodes metals particularly iron and steel. It also deteriorates fabrics, leather, paper, etc., and affects the colour of paints. |
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