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Coagulation is used in water treatment to

  • A.neutralise the acidity of the raw water
  • B.make fine suspended particles settle
  • C.kill the pathogenic bacteria present
  • D.remove the dissolved calcium and magnesium

Answer: B

Alum or ferric salts hydrolyse to a gelatinous hydroxide that neutralises the charge on the colloidal clay and entraps particles too fine to settle on their own. Disinfection and softening are entirely separate steps carried out elsewhere in the plant.

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