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Question
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is
Options:
A .  50 mg/l
B .  100 mg/l
C .  150 mg/l
D .  250 mg/l
Answer: Option D

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