Most widely and commonly used coagulant for the removal of suspended impurities in water is __________________?
Correct answer: C. Alum
- A. Bleaching powder
- B. Slaked lime
- C. Alum
- D. Copper sulphate
Explanation
Alum hydrolyses in water to form gelatinous aluminium hydroxide, which traps and settles suspended particles during coagulation. Bleaching powder is mainly a disinfectant, while lime adjusts alkalinity and copper sulphate is used chiefly against algae.
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