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प्रश्न
How is plaster of Parish prepared? Write chemical equation of the reaction involved.
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उत्तर
When gypsum (CaSO4.2H2O) is heated to a temperature of 100⁰C (373K), it loses three-fourths of its water of crystallisation and forms plaster of Paris.
CaSO4.2H2O Δ → CaSO4.1/2H2O + 3/2 H2O
Gypsum Plaster of Paris
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