Water samples with BOD values of 4 ppm and 18 ppm, respectively, are :
Clean and Highly polluted
Highly polluted and Highly polluted
Clean and Clean
Highly polluted and Clean
Biochemical oxygen demand (BOD) -
The amount of oxygen required for five days in one litre of water at 200 C for the microorganisms to metabolite organic waste.
- wherein
Clear water has BOD less than 5 ppm , highly polluted water has BOD of 17 ppm or more.
As we have learned in BOD that clear water would have BOD value of less than 5ppm where as highly polluted water could have is BOD value of 15ppm or max
Clean and Highly polluted
Option 2)Highly polluted and Highly polluted
Option 3)Clean and Clean
Option 4)Highly polluted and Clean
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