Which gas is used to remove soluble impurities present in water?
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Odour can be due to phenols, hydrogen sulphide, chlorine, soluble salts, pesticides etc. and smacks even when they are present in negligible quantities. For example, DDT can smell in as small a concentration as 0.07 mg/litre. The method most commonly used to remove odour is passing water through activated charcoal.
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