For normal sludge, the value of sludge index for Indian conditions is
A. 0 to 50
B. 50 to 150
C. 150 to 350
D. 350 to 500
Answer: Option C
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50 to 150
Wrong answer 50 to 150 is correct
Wrong answer 59 to 150 is correct
It is 50 to 150....the ans provided is wrong