Which of the following are associated with alum coagulation ?1. A decrease of alkalinity in treated water2. Formation of hydroxide flocs of aluminium 3. A slight decrease of pH in treated water4. An increase of permanent hardnessSelect the correct answer using the codes given below :

Which of the following are associated with alum coagulation ?1. A decr

1.	Which of the following are associated with alum coagulation ?1. A decrease of alkalinity in treated water2. Formation of hydroxide flocs of aluminium 3. A slight decrease of pH in treated water4. An increase of permanent hardnessSelect 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» D. 2 and 4

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Which of the following are associated with alum coagulation ?1. A decrease of alkalinity in treated water2. Formation of hydroxide flocs of aluminium 3. A slight decrease of pH in treated water4. An increase of permanent hardnessSelect the correct answer using the codes given below :

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