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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80 PPM

60PPM

20 PPM

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)

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