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The main difference between gypsum and plaster of Paris is related to what?

Answer and explanation

Correct answer: Amount of water of crystallisation

Gypsum is calcium sulphate dihydrate, CaSO₄·2H₂O. On controlled heating, it loses part of its water of crystallisation and forms plaster of Paris, calcium sulphate hemihydrate, CaSO₄·½H₂O. Thus their principal difference is the amount of chemically combined water, so option A is correct. Metallic shine, chlorine smell, and litmus colour are not the defining chemical differences between these two calcium sulphate forms.

Related tags

GypsumPlaster-Of-ParisWater-Of-CrystallisationCalcium-SulphateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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