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Plaster of Paris (POP) has the formula:

ACaSO₄·2H₂O
BCaSO₄·½H₂O
CCaCO₃
DCa(OH)₂
Answer & Solution
Correct answer: B. CaSO₄·½H₂O
1. POP is calcium sulphate hemihydrate: CaSO₄·½H₂O. 2. Made by heating gypsum (CaSO₄·2H₂O) to ~100 °C. 3. On adding water it sets to gypsum, useful for casts/moulds. _Source: syllabus Science Ch 2 §2.4.4 Plaster of Paris_
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