The setting of Plaster of Paris is:

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(D) The setting of Plaster of Paris is an exothermic process. The chemical reaction is: $CaSO_4 \cdot \frac{1}{2}H_2O + \frac{3}{2}H_2O \rightarrow Ca

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Hydration to yield another hydrate

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(D) The setting of Plaster of Paris is an exothermic process. The chemical reaction is: $CaSO_4 \cdot \frac{1}{2}H_2O + \frac{3}{2}H_2O \rightarrow CaSO_4 \cdot 2H_2O$ (Gypsum). This process involves the hydration of calcium sulfate hemihydrate to form calcium sulfate dihydrate (Gypsum),which is a harder crystalline structure.

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