Question

Name various techniques used for purification of water.
(3 marks)

Answer 1

Water which looks clean may still have disease-carrying microorganisms and dissolved impurities. So, it is essential to purify water before drinking.
Municipal bodies uses various physical and chemical processes before supplying water into households.

• Boiling: It is a very common practice use for obtaining safe drinking water. Boiling kills the germs present in the water. (1 mark)
• Filtration: This is a physical method of removing impurities and in some cases germs also. A popular household filter is a candle type filter. (1 mark)
• Chlorination is a commonly used chemical method for purifying water. It is done by adding chlorine tablets or bleaching powder to the water. (1 mark)