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Which substance is heated to prepare plaster of Paris?

Answer and explanation

Correct answer: Gypsum

When gypsum, \(CaSO_4\cdot 2H_2O\), is heated to about 373 K, it loses part of its water of crystallisation and forms plaster of Paris, \(CaSO_4\cdot \tfrac{1}{2}H_2O\). Therefore, gypsum is correct. Heating limestone mainly produces calcium oxide (lime), not plaster of Paris.

Related tags

Class 10 ScienceAcids Bases SaltsGypsumPlaster Of ParisWater Of Crystallisation

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