A) \[2CaS{{O}_{4}}.{{H}_{2}}O\]
B) \[CaS{{O}_{4}}.2{{H}_{2}}O\]
C) \[CaS{{O}_{4}}.3{{H}_{2}}O\]
D) \[2CaS{{O}_{4}}.1/2{{H}_{2}}O\]
Correct Answer: A
Solution :
Plaster of Paris is hemihydrate of calcium sulphate \[(CaS{{O}_{4}}.1/2{{H}_{2}}O\,\,or\,2CaS{{O}_{4}}.{{H}_{2}}O\] It is used for setting broken or fractured bones, making models, statues and other decorative materials. \[\underset{Gypsum}{\mathop{2CaS{{O}_{4}}.2{{H}_{2}}O}}\,\xrightarrow{390K}\underset{Plaster\,of\,Paris}{\mathop{2CaS{{O}_{4}}}}\,.{{H}_{2}}O+3{{H}_{2}}O\]
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