Some O2 is present in water. The water will be considered as “polluted water” when concentration of O2 in it will be?

A. 4 – 8 ppm
B. Less than 4 ppm
C. Greater than 4 ppm
D. Greater than 8 ppm

Right Answer: B. Less than 4 ppm

December 13, 2017   Hassan Ali    Chemistry  
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