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What is the most correct reason for keeping plaster of Paris away from moisture?

Answer and explanation

Correct answer: It can set on absorbing moisture

Plaster of Paris, or calcium sulphate hemihydrate, reacts with water and changes back into gypsum, which is hard. Moisture from air can therefore begin the setting process before the material is needed. Option A is correct because premature setting makes the powder unusable. The other options describe chemically impossible changes: it does not become sugar, gas, or metal. Hence it must be stored in a dry, airtight container.

Related tags

Plaster-Of-ParisMoistureSettingSaltsClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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