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What is Plaster of Paris? Write a short ...

What is Plaster of Paris? Write a short note on it.

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Gypsum.on heating to a temperature of `120^@ – 130^@C` gives a semi hydrate. It is known as Plaster of Paris.
`underset("Plaster of paris")(CaSO_4.1/2H_2O) rarr underset("Orthorhombic dihydrate")(CasO_4.2H_2O) rarr underset("Monoclinic dihydrate (Gypsum)")(CaSO_4.2H_2O)`
It is used (1) in making casts for statues, toys etc. (2) in surgical bandages for bone fracture (3) in making white chalks.
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