A) \[CaS{{O}_{4}}\,.\,2{{H}_{2}}O\]
B) \[CaS{{O}_{4}}\,.\,\,{{H}_{2}}O\]
C) \[CaS{{O}_{4}}\,.\,\frac{1}{2}{{H}_{2}}O\]
D) \[CaS{{O}_{4}}\,.\,4{{H}_{2}}O\]
Correct Answer: C
Solution :
Calcium sulphate hemihydrate, \[CaS{{O}_{4}}\,.\frac{1}{2}{{H}_{2}}O\], is called Plaster of Paris.
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