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EEJ MAIN Chemistry QUESTION #5522
Question 1
Two water samples A and B have BOD (Biochemical Oxygen Demand) values of 10 and 20, respectively. Which statement is correct?
  • B is more polluted than A.✔️
  • A is fit for drinking, whereas B is not.
  • Both A and B are suitable for drinking.
  • A is more polluted than B.
Correct Answer Explanation
BOD (Biochemical Oxygen Demand) measures the amount of dissolved oxygen needed by microorganisms to decompose organic matter. A higher BOD means more organic pollution. Since BOD of B (20) > BOD of A (10), water B is more polluted. Note: For drinking water, BOD should be less than 5 ppm; both A and B are unsuitable for drinking.