The chemical formula of Plaster of Paris is:

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{CaSO}_{4}

{CaSO}_{4} . 2 H_{2} O

{CaSO}_{4} . \frac{1}{2} H_{2} O

{CaSO}_{4} . H_{2} O

answer is C.

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Detailed Solution

Concept- Plaster of Paris is a white powder that is used for plastering walls, making casts for broken bones, making sculptures, and many more.
The chemical name of plaster of Paris is Calcium sulphate hemihydrate and the chemical formula of plaster of Paris is

CaS O_{4} . \frac{1}{2} H_{2} O

.
It is obtained from dehydrating gypsum (

CaS O_{4} . 2 H_{2} O

). Some of the important properties of plaster of Paris are as follows:
●       When water is added, gypsum crystals are formed, leading to a solid state.
●       It shows an exothermic solidification process and can be catalysed by sodium chloride. Plaster of Paris is retarded with stone or borax.
●       Plaster of Paris consists of anhydrous calcium sulphate at a temperature of 473 K. This is also known as the dead burnt plaster.
Therefore,

{CaSO}_{4} . \frac{1}{2} H_{2} O

is the chemical formula for plaster of Paris.
Hence, option 3 is correct.

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