A) \[CaS{{O}_{4}}.2{{H}_{2}}O\]
B) \[CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O\]
C) \[MgS{{O}_{4}}.2{{H}_{2}}O\]
D) \[CuS{{O}_{4}}\]
Correct Answer: A
Solution :
Gypsum is hydrated calcium sulphate. \[CaS{{O}_{4}}.2{{H}_{2}}O\] Gypsum when heated strongly loses whole of its water of hydration. It does not set like plaster of Paris and so, gypsum is said to be dead burnt.
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