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Why is plaster of Paris stored in a closed container away from moisture?

Answer and explanation

Correct answer: It can absorb water and change into gypsum

Plaster of Paris is calcium sulfate hemihydrate, CaSO4·1/2H2O. It reacts with water or atmospheric moisture and changes into gypsum, CaSO4·2H2O. This hydration causes the material to set and become hard, so it may lose its usefulness during storage. The other choices describe no relevant property: it neither forms a metal from oxygen, turns black in ordinary light, nor explodes with nitrogen.

Related tags

Plaster-Of-ParisGypsumWater-Of-CrystallisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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