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Which substance is formed when gypsum is heated at about 373 K?

Answer and explanation

Correct answer: Plaster of Paris

Gypsum is calcium sulphate dihydrate, CaSO₄·2H₂O. On controlled heating to about 373 K, it loses part of its water of crystallisation and forms calcium sulphate hemihydrate, CaSO₄·½H₂O, called plaster of Paris. Thus, option C is correct. Washing soda and baking soda are different sodium salts, while bleaching powder is a chlorine-based substance and is not produced by heating gypsum. Controlled temperature prevents complete dehydration.

Related tags

GypsumPlaster-Of-ParisWater-Of-CrystallisationHeatingClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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