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All impurities are oxidised into the _________ and ___________ in the biological oxidation process.

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All impurities are oxidised into the _________ and ___________ in the biological oxidation process.

(a) Oxygen and water

(b) Carbondioxide and water

(c) Nitrogen and water

(d) Chlorine an water

The question was posed to me in an international level competition.

Question is from Biological Oxidation Process topic in chapter Water of Applied Chemistry

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Right option is (b) Carbondioxide and water

The explanation is: All impurities are oxidised into the carbondioxide and water in the biological oxidation process. The sludge formed in this process will be settled down quickly and gives clear supernatant.

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