Alum as a coagulant is found to be effective between pH range of______

1.	Alum as a coagulant is found to be effective between pH range of________
A.	8.0 to 10.0
B.	8.5 to 10.5
C.	6.5 to 8.5
D.	7.0 to 9.0
Answer» D. 7.0 to 9.0

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Alum as a coagulant is found to be effective between pH range of________

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