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Dead burnt plaster is
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By Expert Faculty of Sri Chaitanya
a
CaSO4
b
CaSO4⋅12H2O
c
CaSO4⋅H2O
d
CaSO4⋅2H2O
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Correct option is A
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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