1.

If initial Dissolved Oxygen (DO) and final DO after 5 days incubation at 20° C in 1·0% dilution sample are 5·0 mg/L and 4·0 mg/L respectively, what is 5-day BOD of the same sample in mg/L

A. 50
B. 100
C. 150
D. 200
Answer» C. 150


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