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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