A) \[CaS{{O}_{4}}\cdot 2{{H}_{2}}O\]
B) \[MgS{{O}_{4}}\cdot 7{{H}_{2}}O\]
C) \[CaS{{O}_{4}}\cdot 1/2\,{{H}_{2}}O\]
D) \[CaS{{O}_{4}}\]
E) \[MgS{{O}_{4}}\]
Correct Answer: D
Solution :
Plaster of Paris or gypsum when heated to about \[200{}^\circ C\] is converted into anhydrous calcium sulphate. The anhydrous calcium sulphate is known as dead burnt plaster because it does not set like plaster of Paris when moistened with water. \[\underset{\text{plaster}\,\text{of}\,\text{Paris}}{\mathop{CaS{{O}_{4}}\cdot \frac{1}{2}{{H}_{2}}O}}\,\xrightarrow{200{}^\circ C}\underset{\text{dead}\,\,\text{burnt}\,\,\text{plaster}}{\mathop{CaS{{O}_{4}}+\frac{1}{2}{{H}_{2}}O}}\,\]
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