(B) Gypsum is $CaSO_4 \cdot 2H_2O$. When heated at $393 \, K$ $(120 \, ^oC)$,it forms Plaster of Paris $(CaSO_4 \cdot 0.5H_2O)$. When heated at higher

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(B) Gypsum is $CaSO_4 \cdot 2H_2O$. When heated at $393 \, K$ $(120 \, ^oC)$,it forms Plaster of Paris $(CaSO_4 \cdot 0.5H_2O)$. When heated at higher temperatures,specifically around $300 \, ^oC$ $(573 \, K)$,all water of crystallization is lost,resulting in the formation of anhydrous calcium sulfate,also known as dead burnt plaster $(CaSO_4)$.