A) \[CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O\]
B) \[CaS{{O}_{4}}.{{H}_{2}}O\]
C) \[CaS{{O}_{4}}.2{{H}_{2}}O\]
D) \[CaS{{O}_{4}}.3{{H}_{2}}O\]
Correct Answer: A
Solution :
Plaster of Paris \[CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O\] Gypsum \[CaS{{O}_{4}}.2{{H}_{2}}O\]
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