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100 ml of a sample of water required 1.9...

100 ml of a sample of water required 1.96 mg of potassium dichromate in the presence of `50% H_2SO_4 ` for the oxidation in the presence organic matter in it. Calculate the chemical oxygen demand.

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C .O.D = number of mg O_2 required/ volume of water (in litre)
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