What is the chemical formula of Plaster of Paris?
- A$Ca_2SiO_4 \cdot 0.5H_2O$
- B$Ca_2SiO_4 \cdot 2H_2O$
- C$CaSO_4 \cdot 0.5H_2O$
- D$CaSO_4 \cdot 2H_2O$
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