Dead burnt plaster is

(i) CaSO₄

(ii) CaSO₄⋅ $\frac{1}{2}$ H₂O

(iii) CaSO₄⋅H₂O

(iv) CaSO₄⋅2H₂O 

<p><span data-sheets-root="1">This is a multiple choice type question as classified in NCERT Exemplar</span></p><p>Correct option (i)</p><p>An anhydrous calcium sulfate is dead burnt paris. It is known as dead burnt because it does not set like plaster when moistened with water. When gypsum is heated the water of crystallization is lost and an anhydrous calcium sulphate is obtained.</p>

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