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Chlorine which gets consumed in the oxidation of impurities before disinfection is ______________

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Chlorine which gets consumed in the oxidation of impurities before disinfection is ______________

(a) Free chlorine

(b) Residual chlorine

(c) Chlorine demand

(d) Residual demand

The question was asked by my college director while I was bunking the class.

My question is from Chlorination in portion Properties of Disinfection of Environmental Engineering

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Correct answer is (c) Chlorine demand

To explain: Chlorine has the oxidizing power which oxidizes organic and inorganic impurities present in water and the amount of chlorine, which gets consumed before disinfection is called as chlorine demand.

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