Question

Write the use of bleaching powder in purification of water.

Hint:

Bleaching powder is an effective and inexpensive disinfectant widely used for sterilizing drinking water and public places.

Answer 1

Step 1: Understanding bleaching powder.
Bleaching powder is chemically known as calcium oxychloride (CaOCl2). It is prepared by passing chlorine gas over dry slaked lime [Ca(OH)2].
Step 2: Action in water purification.
When bleaching powder is added to water, it releases chlorine, which kills bacteria and other microorganisms present in the water. \[ \text{CaOCl}_2 + \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{Cl}_2 \] Step 3: Conclusion.
Thus, bleaching powder acts as a disinfectant by releasing chlorine, which destroys harmful germs in water and makes it safe for drinking.