AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Calcium sulphate hemihydrate (CaSO₄·½H₂O) is called Plaster of Paris because it was historically manufactured from the large gypsum deposits found in Paris, France.
This is a factual 1-mark question. The examiner simply wants the historical/geographical reason for the name. No chemical explanation is required here. Remember: Plaster of Paris is made by heating gypsum (CaSO₄·2H₂O) at 373 K, and the name comes from the gypsum mines near Paris.