Chemical Oxygen Demand (COD) of a sample is always greater than Biochemical Oxygen Demand (BOD) since it represents

non-biodegradable organic matter

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biodegradable organic matter only

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biodegradable and non-biodegradable organic matter

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inorganic matter

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Solution

The correct option is C biodegradable and non-biodegradable organic matter
COD measures both biodegradable and non-biodegradable organic matter. COD is the oxygen equivalent of organic matter that can be oxidized measured by using a strong chemical oxidizing agent in an acidic medium.

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