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Q. What is the common name of Calcium Sulphate Hemihydrate?
Answer: Plaster of paris
Notes: Plaster of Paris is calcium sulphate hemihydrate. The formula is given as, CaSO4.1/2 H2O or (2 CaSO4) . H2O. The powder is called plaster of Paris, because the gypsum which was used to get the powder was mainly found in Paris.

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