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Question
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?
Options:
A .  Ozone and iodine
B .  Chlorine or its compounds
C .  Ultraviolet light for irradiation of water
D .  All A., B. & C.
Answer: Option D
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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