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Pick out the correct statement. | |
A. | Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present in water. [Wrong Answer] |
B. | COD is determined by oxidising the organic matter present in water with potassium dichromate in cone, sulphuric acid solution at boiling temperature for specified time. [Wrong Answer] |
C. | COD is related to BOD of a given waste in water but the relationship varies for different wastes. Typically COD of potable water may be 1-2 mg/litre. [Wrong Answer] |
D. | all (a), (b) and (c). [Correct Answer] |