A) \[CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O\]
B) \[CaS{{O}_{4}}.2{{H}_{2}}O\]
C) \[CaS{{O}_{4}}.{{H}_{2}}O\]
D) \[CaS{{O}_{4}}.4{{H}_{2}}O\]
Correct Answer: A
Solution :
Calcium sulphate hemihydrate \[\left( CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O \right)\]is called plaster of parts.
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