A sample of pond water contains 40mg of organic matter requires 32mg of dissolved oxygen if pond water contains 200 mg of organic matter per four liters, BOD value is
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a
80 PPM
b
60PPM
c
20 PPM
d
40 PPM
answer is D.
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Detailed Solution
Step – 1 40 mg of organic matter requires – 32 mg of dissolved oxygen 200 mg of organic matter requires ----? (wt oxygen)