In the hardening stage of Plaster of Paris, the compound formed is:

  • A
    $CaSO_4$
  • B
    $Orthorhombic \ CaSO_4 \cdot 2H_2O$
  • C
    $CaSO_4 \cdot H_2O$
  • D
    $Monoclinic \ CaSO_4 \cdot 2H_2O$

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