A) \[CaS{{O}_{4}}\cdot \frac{1}{2}{{H}_{2}}O\]
B) \[CaS{{O}_{4}}\cdot 2{{H}_{2}}O\]
C) \[CaS{{O}_{4}}\cdot {{H}_{2}}O\]
D) \[CaS{{O}_{4}}\cdot 4{{H}_{2}}O\]
Correct Answer: A
Solution :
Calcium sulphate hemihydrate\[\left( CaS{{O}_{4}}\cdot \frac{1}{2}{{H}_{2}}O \right)\] is called plaster of Paris.
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