A) \[CuS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O\]
B) \[CaOC{{l}_{2}}\]
C) \[CaS{{O}_{4}}.\,2{{H}_{2}}O\]
D) none of these
Correct Answer: A
Solution :
Plaster of Paris is \[CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O\]
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