JEE Main · ChemistryHard
In the context of water pollution, the Biochemical Oxygen Demand (BOD) value of clean water is significantly lower than that of highly polluted water. Which of the following statements is true regarding the BOD test?
- A. is the amount of oxygen required by bacteria to break down organic matter in liter of water over days at .
- B.Clean water typically has a value of less than ppm.
- C.Highly polluted water has a value of less than ppm.
- D.BOD measures the total amount of dissolved oxygen present in the water sample.
Show correct answer & step-by-step solution
Correct answer: B — Clean water typically has a value of less than ppm.
Solution
- BOD is defined as the amount of dissolved oxygen required by aerobic microorganisms to decompose organic matter in a water sample.
- The standard incubation period for the BOD test is 5 days at .
- Clean water has a BOD value of less than ppm, while highly polluted water has values exceeding ppm.
- Hence the answer is (B).
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