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

Q. 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

1. Ozone and iodine
2. Chlorine or its compounds
3. Ultraviolet light for irradiation of water
4. All (a), (b) & (c)

Answer: Option 4