Plaster of Paris is obtained from the calcination of-
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A.
Bauxite
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B.
Dolomite
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C.
Gypsum
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D.
Lime stone
Correct Answer:
C. Gypsum
Explanation:
Plaster of Paris is produced by heating gypsum to approximately 150 degrees Celsius. This chemical process, known as calcination, involves the partial dehydration of gypsum (calcium sulfate dihydrate) to form calcium sulfate hemihydrate. When this powder is mixed with water, it rehydrates and hardens into a solid mass, making it widely used in construction, sculpture, and medical casts.
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