593. If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is____________________?

by
A. 200 ppm
B. 225 ppm
C. 250 ppm
D. None of these
✅ The correct answer is option C.

Leave a Comment