On heating gypsum at 373 K, it loses water molecules and becomes _________, called Plaster of Paris.
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A.
calcium sulphate hemihydrate
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B.
calcium sulphate dihydrate
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C.
calcium sulphate
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D.
calcium sulphate trihydrate
Correct Answer:
A. calcium sulphate hemihydrate
Explanation:
When gypsum is heated to 373 K (100°C), it undergoes a chemical reaction where it loses three-quarters of its water of crystallization. Specifically, the dihydrate form of calcium sulphate (CaSO4·2H2O) is converted into calcium sulphate hemihydrate (CaSO4·1/2H2O). This resulting substance is commonly known as Plaster of Paris, which is widely used in construction and medical applications because it hardens into a solid mass when mixed with water.
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