• # question_answer Which of the following salt becomes plaster of paris on being appropriately hydrated [CPMT 1985] A) $ZnC{{O}_{3}}$ B) $CaS{{O}_{4}}$ C) $MgS{{O}_{4}}$ D) $CaC{{O}_{3}}$

$\underset{\text{Gypsum}}{\mathop{CaS{{O}_{4}}.2{{H}_{2}}O}}\,\xrightarrow{{{120}^{o}}C}\underset{\text{Ploster of paris}}{\mathop{CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O}}\,+1\frac{1}{2}{{H}_{2}}O$