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What substance is formed when gypsum is heated?

Answer and explanation

Correct answer: Plaster of Paris

The governing concept is the effect of controlled heating on a hydrated salt. Gypsum is calcium sulphate dihydrate, CaSO₄·2H₂O. On careful heating, it loses part of its water of crystallisation and changes into calcium sulphate hemihydrate, CaSO₄·½H₂O, called plaster of Paris. Thus option A is correct. Washing soda, baking soda, and common salt are different sodium or calcium salts and are not the product of heating gypsum.

Related tags

GypsumPlaster Of ParisHydrated SaltsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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