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 \[\left( \text{CaS}{{\text{O}}_{\text{4}}}\text{.}\frac{\text{1}}{\text{2}}{{\text{H}}_{\text{2}}}\text{O} \right)\] is called plaster of paris.
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