Civil Engineering - UPSC Civil Service Exam Questions - Discussion

39. 

Which of the following are associated with alum coagulation ?
1. A decrease of alkalinity in treated water
2. Formation of hydroxide flocs of aluminium
3. A slight decrease of pH in treated water
4. An increase of permanent hardness
Select the correct answer using the codes given below :

[A]. 1, 2 and 3
[B]. 1, 3 and 4
[C]. 1, 2, 3 and 4
[D]. 2 and 4

Answer: Option C

Explanation:

No answer description available for this question.

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