BOD of sample first is 4ppm and BOD of second sample is 18ppm. Which one is correct statement
Channel: PANACHE
Date: 15/10/2020

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BOD of sample first is 4ppm and BOD of second sample is 18ppm. Which one is correct statement
(a) Both are highly polluted
(b) Both are clean
(c) First is clean and second is highly polluted
(d) Second is clean and first is highly polluted