Correct option is D
The Correct Answer Is: (d) calcium sulphate hemihydrate
Explanation:
Plaster of Paris (POP) is chemically calcium sulphate hemihydrate (CaSO₄·½H₂O).
It is obtained by heating gypsum (CaSO₄·2H₂O) at about 373K (100°C).
During this heating, three-fourths of the water of crystallization is removed, forming Plaster of Paris.
Information Booster:
- Plaster of Paris is widely used in making sculptures, molds, and casts.
- It is used in orthopedic applications for making fracture casts and surgical molds.
- POP is fire-resistant and a good insulator, making it useful for wall coatings.
- POP should be stored in airtight containers as exposure to moisture causes it to harden prematurely.
- It is also used in dentistry for making dental molds.
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