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COD is abbreviated as ___________

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COD is abbreviated as ___________

(a) Chemical oxygen demand

(b) Complex oxygen demand

(c) Customary oxygen demand

(d) Chemical oxygen deficit

This question was addressed to me during a job interview.

Question is taken from Population Equivalent and Relative Stability in section Wastewater Characteristics of Environmental Engineering

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Right option is (a) Chemical oxygen demand

To explain I would say: COD is abbreviated as chemical oxygen demand. It is measured in ppm or mg/L.

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