Select the inappropriate statement about Chlorination of water

A. Chlorine best act at pH 7.2 of water

B. The minimum recommended concentration of free chlorine is 0.5 mg/L for one hour

C. Hypochlorous acid play main role in disinfection

D. Chloroscope instrument is used to measure residual chlorine

Correct Answer: Chlorine best act at pH 7.2 of water

Description: Chlorine best act at as a a disinfectant when the pH of water is7 because of predominance of Hypochlorous acid. 2.5mg bleaching powder can disinfect 1000 L of water. Chlorine has no effect on spores, cyst, ova, Hep. A, Polio virus, cyclopes. Remaining all options given are true.

Category: Social & Preventive Medicine

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