Answer:
Plaster of Paris is prepared by heating gypsum to 393 K.
\[\underset{\text{Gypsum}}{\mathop{2\,CaS{{O}_{4}}.\,2\,{{H}_{2}}O}}\,\xrightarrow{393\,K}\,\underset{\text{Plaster}\,\text{of}\,\text{Paris}}{\mathop{2CaS{{O}_{4}}.\,1/2\,{{H}_{2}}O}}\,+\,3\,{{H}_{2}}O\]
If the temperature is raised above 393 K, plaster of paris is further dehydrated to form anhydrous calcium sulphate which is also called dead burnt plaster since it loses the properties of setting with water
\[\underset{\text{Plaster}\,\text{of}\ \text{Paris}}{\mathop{2CaS{{O}_{4}}.\,1/2\,{{H}_{2}}O}}\,\xrightarrow{>393\,K}\,\underset{\text{Dead}\,\text{burnt}\,\text{plaster}}{\mathop{2\,CaS{{O}_{4}}}}\,+{{H}_{2}}O\]
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