A white chemical compound becomes hard on mixing proper quantity of water. It is also used in surgery to maintain joints in a fixed position. Name the chemical compound.
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Plaster of Paris; calcium sulphate hemihydrate is the white chemical.
Calcium sulphate is the inorganic compound with the formula CaSO4 and related hydrates.
In the form of γ-anhydrite, the anhydrous form, it is used as a desiccant.
One particular hydrate is better known as plaster of Paris, and another occurs naturally as the mineral gypsum. It has many uses in industry.
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That chemical compounds is commonly known as 
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