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Uses of halogens and their compounds.

Answer Text:
Some uses of halogens and their compounds.
1. Fluorine is a raw material in the preparation of a synthetic fibre known as polytetrafluoroethane.
2. Some compounds of fluorine are added to water and some tooth pastes in small quantities to reduce tooth decay.
3. Fluorine is used in the manufacture of hydrogen fluoride used to engrave words or pictures on glass.
4. Chlorine is used to make bleaches used in paper and textile industries.
5. Chlorine is added to water to kill micro-organisms in water treatment works.
6. Chlorine is used in the manufacture of a plastic known as polyvinylchloride (PVC).
7. Chlorine is used in large scale manufacture of hydrochloric acid.
8. Bromine is used in the manufacture of silver bromide which is used to make the light
sensitive photographic paper and films.
9. A solution of iodine in alcohol (tincture of iodine) is used as a disinfectant.