Water samples with BOD values of 4 ppm and 18 ppm, respectively are :
Show Hint
- Clean and Highly polluted
- Highly polluted and Clean
- Highly polluted and Highly polluted
- Clean and Clean
The Correct Option is A
Solution and Explanation
Clean water: BOD less than 5 ppm. Highly polluted water: BOD of 17 ppm or more.
4 ppm < 5 ppm, so the first sample is clean; 18 ppm > 17 ppm, so the second sample is highly polluted.
Answer: (1) Clean and Highly polluted
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