UPSC Civil Service Exam Questions - Civil Engineering Questions and Answers

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Discussion :: UPSC Civil Service Exam Questions

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 :

1, 2 and 3

1, 3 and 4

1, 2, 3 and 4

2 and 4

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