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Question

The value of biological oxygen demand of highly polluted water is: 
  1. < 5 ppm
  2. = 5 ppm
  3. = 16 ppm
  4. > 16 ppm


Solution

The correct option is D > 16 ppm
The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water is called Biochemical Oxygen Demand. 

Clean water has less than 5 ppm BOD value, whereas, highly polluted water has BOD value of 17 ppm or more. 

Thus, the correct answer is option A 

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