First slide

Anomalous behaviour of Lithium, Diagonal Relationship with Mg

Question

${CaSO}_{4} . 2 H_{2} O (gypsum) \overset{' T' kelvin}{\to} 2 {CaSO}_{4} . H_{2} O (Plaster of paris)$ . ‘T’ is about

Easy

A

293 K
B

393 K
C

423 K
D

323 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 ${CaSO}_{4}$ so formed is called “Dead burnt plaster” (or) “Dead burnt gypsum”.

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