In purification of potable water the coagulant used is:
Correct answer: D. Alum
- A. Nickel sulphate
- B. Copper sulphate
- C. Barium sulphate
- D. Alum
Explanation
The materials which are suspended or present in the colloidal form in raw water are removed by coagulation. The coagulant such as aluminium sulphate or alum is added to the raw water, which causes the precipitation of suspended impurities.
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