1.

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 

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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