First slide

Plaster of paris & gypsum

Question

Dead burnt plaster is formed when gypsum is heated to

Easy

A

393 K
B

473 K
C

373 K
D

297 K

Solution

When gypsum is heated at about 393 K it gets converted to plaster of Paris.
If the temperature becomes greater than 393 K, gypsum loses all the water of crystallization . Setting property is lost. Anhydrous $C a S O_{4}$ so formed is called “Dead burnt plaster” (or) “Dead burnt gypsum”.

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