s-Block ElementsHard

Question

Setting of plaster of paris involves :

Options

A.the oxidation with atmoshperic oxygen.
B.the removal of water to form anhydrous calcium sulphate.
C.the hydration to form the orthorhombic form of gypsum.
D.the reaction with atmospheric carbondioxide gas.

Solution

2 CaSO4 .H2O CaSO4 . 2 H2O (orthorhombic gypsum).

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