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Water samples with BOD values of 4ppm and 18ppm, respectively, are : (1) Clean and Highly polluted (2) Highly polluted and Clean (3) Clean and Clean (4) Highly polluted and Highly polluted |
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Answer» The correct option (1) Clean and Highly polluted Explanation: Clean water would have BOD value of less than 5ppm whereas highly polluted water could have a BOD value of 17ppm or more. |
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