First slide
Anomalous behaviour of Lithium, Diagonal Relationship with Mg
Question

CaSO4.2H2Ogypsum'T'kelvin2CaSO4.H2OPlasterofparis. ‘T’ is about

Easy
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 CaSO4 so formed is called “Dead burnt plaster” (or) “Dead burnt gypsum”.

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