Q.

Dead burnt plaster is

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a

CaSO4

b

CaSO4⋅12H2O

c

CaSO4⋅H2O

d

CaSO4⋅2H2O

answer is A.

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Detailed Solution

Plaster of Paris is prepared by heating gypsum at 120°C2CaSO4⋅2H2O⟶ Gypsum ⟶CaSO42⋅12H2OPlaster of Paris+3H2OOn heating plaster of Paris at 200°C, if forms anhydrous calcium sulphate, i.e. dead plaster which has no setting property as it absorbs water very slowly.CaSO4⋅12H2O⟶200∘CCaSO4 Anhydride ⟶1100∘CCaO+SO3
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