Alum as a coagulant is found to be most effective when pH range of water is
A. 2 to 4
B. 4 to 6
C. 6 to 8
D. 8 to 10
Answer:C
Alum as a coagulant is found to be most effective when pH range of water is
A. 2 to 4 B. 4 to 6 C. 6 to 8 D. 8 to 10