Dissolved oxygen values of four water samples A,B,C and D are respecti – InterviewSolution

1.	Dissolved oxygen values of four water samples A,B,C and D are respectively 6 ppm, 5 ppm, 1 ppm and 3 ppm. Which is polluted?
Answer» Solution :LESSER the DO VALUE GREATER the extent of pollution of water. THUS, C is the most polluted water sample.

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