A) \[CaS{{O}_{4}}.2{{H}_{2}}O\]
B) \[MgS{{O}_{4}}.2{{H}_{2}}O\]
C) \[CaS{{O}_{4}}.1/2{{H}_{2}}O\]
D) \[CaS{{O}_{4}}\]
Correct Answer: D
Solution :
Anhydrous\[CaS{{O}_{4}}\]is known as dead burnt plaster because it loses the properties of setting with water.
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