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Plaster of Paris is obtained when gypsum...

Plaster of Paris is obtained when gypsum is heated to

A

293 K

B

493 K

C

593 K

D

393 K

Text Solution

Verified by Experts

The correct Answer is:
D
`2CaSO_(4).2H_(2)Ooverset(393K)to2CaSO_(4).(1)/(2)H_(2)O+3H_(2)O`
Above 393 K no water of crystallization is left and anhydrous calcium sulphate called head burnt plaster is formed. It is so called because it loses the properties of setting with water. Gypsum should not be allowed to come in contact with C containing fuel otherwise some of it will be reduced to calcium sulphite.
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