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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ev163

Select the correct statements about water treatment.

  1. AChlorination removes dissolved lead ions by precipitation
  2. BThe activated sludge process uses aerobic microorganisms to oxidise organic matter
  3. CAlum is used for coagulating suspended particles into a floc that settles
  4. DChlorination is used to kill pathogenic microorganisms

Answer: B, C, D

Chlorine disinfects, alum forms a gelatinous floc that carries down suspended matter, and activated sludge treatment is an aerobic process. Chlorination does not remove dissolved , so the last statement is false.
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