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Why is plaster of Paris used to support a fractured bone?

Answer and explanation

Correct answer: It forms hard gypsum when mixed with water

Plaster of Paris is used because it undergoes a controlled setting reaction with water. Calcium sulphate hemihydrate changes into gypsum, CaSO4·2H2O, forming a hard, mouldable support around the injured limb. The hardened cast restricts movement and helps protect the fracture while healing occurs. Thus option A is correct; it neither dissolves bone nor remains liquid or disappears.

Related tags

Plaster Of ParisFracture SupportGypsum SettingAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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