Which of the following is the most widely used disinfectant in water treatment ?

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CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone?

A. 102 B. 105 C. 109 D. 1015...

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A. 0.001 B. 0.1 C. 1 D. 5...

Presence of bacteria in potable (drinking) water causes_________________?

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