Question:
Dead burn plaster is
Dead burn plaster is
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Dead burnt plaster is anhydrous calcium sulphate and does not harden on adding water.
Updated On: Mar 19, 2026
- CaSO₄· 2H₂O
- MgSO₄· 7H₂O
- CaSO₄· (1)/(2)H₂O
- CaSO₄
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The Correct Option is D
Solution and Explanation
Step 1: Plaster of Paris is calcium sulphate hemihydrate:
CaSO₄· (1)/(2)H₂O
Step 2: On strong heating, it loses all water of crystallisation and becomes dead burnt plaster, i.e. anhydrous calcium sulphate:
CaSO₄
Step 3: Dead burnt plaster does not set with water.
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