Free Set
Question
The chemical formula for Plaster of Paris is?
Options
ACaSO4.2H2O
BCaSO4.1/2H2O Correct Answer
CCaCO3
DCaO
Correct Answer & Explanation
Option B: CaSO4.1/2H2O
Rationale
Plaster of Paris is calcium sulfate hemihydrate CaSO4.1/2H2O or (CaSO4)2.H2O. It is made by heating gypsum CaSO4.2H2O at 100 degree C. It hardens on mixing with water forming gypsum again. Used in fracture bandages.
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