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प्रश्न
How is plaster of Paris prepared?
उत्तर
Plaster of Paris is a hemihydrate of calcium sulphate \[\ce{CaSO4.H2O}\]. It is obtained by heating gypsum at 393 K
\[\ce{\underset{\text{Gypsum}}{2CaSO4.2H2O_{(s)}} ->[\Delta] \underset{\text{Plaster of Paris}}{2CaSO4.H2O} + 3H2O}\]
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