Dead burnt plaster is
B. CaSO4. 1/2H2O
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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Describe the importance of the following: (i) limestone (ii) cement (iii) plaster of paris.NCERT - Chemistry Part-II