1.

Value of BOD of clean and polluted water (a) Clean water < 5ppm, Polluted water < 10ppm(b) Clean water > 5ppm, Polluted water < 10ppm(c) Clean water > 5ppm, Polluted water > 10ppm(d) Clean water > 10ppm, Polluted water > 20ppm

Answer»

(a) Clean water < 5ppm, Polluted water < 10ppm

BOD of clean water is 3-5 ppm and polluted water is 6-9 ppm.



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