A) \[CaS{{O}_{4}}\cdot 2{{H}_{2}}O\]
B) \[CaS{{O}_{4}}\]
C) \[CaS{{O}_{4}}\cdot \frac{1}{2}{{H}_{2}}O\]
D) \[S{{O}_{3}}\]and\[CaO\]
Correct Answer: C
Solution :
\[\underset{Gypsum}{\mathop{2CaS{{O}_{4}}}}\,\cdot 2{{H}_{2}}O\xrightarrow{393\,\,K}\underset{Plaster\,\,of\,\,Paris}{\mathop{2CaS{{O}_{4}}\cdot \frac{1}{4}{{H}_{2}}O}}\,\] \[+3{{H}_{2}}O\]
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