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Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be (a) highly polluted (b) poor in dissolved oxygen

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Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be 

(a) highly polluted 

(b) poor in dissolved oxygen

(c) rich in dissolved oxygen 

(d) low COD

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1 Answer

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(c) rich in dissolved oxygen

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