Name the raw material used for the preparation of plaster of Paris.

State two uses each of the following compounds:

(a) Sodium hydroxide

(b) Chlorine

(c) Hydrogen

(d) Hydrochloric acid

What is the common name of the compound CaOCI₂?

Which property of plaster of Paris is utilized in making casts for broken limbs in hospitals?

Explain why chlorine is used for sterilizing drinking water supply.