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Question

Plaster of Paris is obtained by:

A
adding water to calcium sulphate.
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B
adding sulphuric acid to calcium hydroxide.
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C
heating gypsum to a very low temperature.
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D
heating gypsum to 120C.
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Solution

The correct option is D heating gypsum to 120C.
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The chemical name of plaster of Paris is calcium sulphate hemihydrate(CaSO4.12H2O). It is obtained by heating gypsum at 120 C. The reaction involved is:

CaSO4.2H2O(s)120C−−CaSO4.12H2O(s)+32H2O(l) Gypsum Plaster of paris

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