The most widely used coagulant for removing suspended impurities from water is__________________?
Correct answer: B. Alum
- A. Bleaching powder
- B. Alum
- C. Calcium sulphate
- D. Chlorine
Explanation
Alum, usually hydrated aluminium sulfate, hydrolyses in water to form a gelatinous precipitate that traps suspended particles and helps them settle. Chlorine disinfects water, while bleaching powder mainly supplies chlorine.
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