Q.

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)
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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