845. If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is_____________________? September 7, 2025 by Admin A. 50 ppm B. 100 ppm C. 150 ppm D. 200 ppm ✅ The correct answer is option D.
