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Q.

The chemical name of plaster of paris is {fill _regular} and the chemical name of gypsum is [[1]].

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Detailed Solution

Concept- The chemical name of plaster of paris is calcium sulphate hemihydrate and the chemical name of gypsum is calcium sulphate dihydrate. Plaster of Paris is a white powder that is used for plastering walls, making casts for broken bones, making sculptures, and many more.
The plaster of Paris is chemically called 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

). The gypsum is chemically called calcium sulphate dihydrate.
From plaster of paris, gypsum can be prepared as follows;

Hence, the answers are calcium sulphate hemihydrate and calcium sulphate dihydrate respectively.

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