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Water Treatment

Q1: The chemical oxygen demand (COD)measures the

A amount of oxygen required for growth of microorganisms in water

B amount of oxygen that would be removed from the water in order to oxidize pollution

C amount of oxygen required to oxidize the calcium present in waste water

D none of the above

ANS:B - amount of oxygen that would be removed from the water in order to oxidize pollution

COD is the amount of oxygen required to chemically oxidize the pollutants. So corrections should be made



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