Question

(a) What is the common name of the compound CaOCl2 ?
(b) Name the raw material used for the preparation of plaster of Paris.
(c) Which property of plaster of Paris is utilised in making casts for broken limbs in hospitals ?
(d) Explain why chlorine is used for sterilising drinking water supply.

Lakhmir Singh Chemistry Class 10

Answer 1

caocl2 = bleaching powder
raw material = gypsum and water
in hospital used in fracture for broken limbs for plaster
chlorine is used for sterilising drinking water supply because chlorine filter the waste and dirty particle

Answer 2

Explanation:

A. CaOCl2 is commonly known as bleaching powder. It is also known as chloride of lime.

B. Gypsum is the raw material used in the preparation of plaster of Paris.

C. Plaster of Paris has a remarkable property of setting into a hard mass on wetting with water. This property of plaster of Paris is utilised in making casts for broken limbs in hospitals.

D. Chlorine is used to sterilise drinking water supply because chlorine is a disinfectant (which kills germs like bacteria present in water and makes it safe).

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