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प्रश्न
A 5ml sample of waste water was refluxed with 30ml of potassium dichromate solution and after refluxing excess unreacted dichromate required 23ml of O.1M FAS solution. A blank of distilled water on refluxing with 30ml of dichromate solution required 36ml of O.1M FAS solution. Calculate the COD value of the waste water.
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