Q. 14

Dead burnt plaster is
A. CaSO4

B. CaSO4. 1/2H2O

C. CaSO4.H2O

D. CaSO4.2H2O

Answer :

Dead burnt plaster is formed when gypsum CaSO4.2H2O is heated to 393K. This causes loss of water of crystallisation and forms anhydrous calcium sulphate.

2(CaSO4.2H2O) 2(CaSO4).H2O + 3H2O

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