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Question: Answered & Verified by Expert
Water samples with BOD values of 4 ppm and 18 ppm, respectively, are:
ChemistryEnvironmental ChemistryJEE MainJEE Main 2019 (12 Jan Shift 1)
Options:
  • A Highly polluted and Highly polluted
  • B Clean and Clean
  • C Highly polluted and Clean
  • D Clean and Highly polluted
Solution:
1908 Upvotes Verified Answer
The correct answer is: Clean and Highly polluted
Clean water has a BOD value of less than 5 ppm whereas highly polluted water could have a BOD value of 17ppm so more polluted.

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