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  4. Biochemical oxygen demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct?

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Q. Biochemical oxygen demand $(BOD)$ value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct?

BITSATBITSAT 2021

Solution:

Clean water has $BOD$ value less than $5\, ppm$. Polluted water has $BOD$ value higher than $10\, ppm$.