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Plaster of Paris is formed by controlled heating of gypsum. The main change is related to what?

Answer and explanation

Correct answer: Change in the amount of water of crystallisation

Gypsum is hydrated calcium sulphate, represented as CaSO4·2H2O. On controlled heating, it loses part of its water of crystallisation and forms plaster of Paris, CaSO4·½H2O. Thus option A correctly identifies the main chemical change. The process does not increase the number of metals, convert a salt into sugar, or involve the complete disappearance of an acid. Excessive heating can remove more water, so control is important.

Related tags

GypsumPlaster-Of-ParisWater-Of-CrystallisationSaltsClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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