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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
Answer: (d).all (a), (b) & (c).

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