The value of biological oxygen demand of highly polluted water is:

> 16 ppm

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< 5 ppm

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= 5 ppm

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= 16 ppm

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Solution

The correct option is A > 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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