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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