Dead burnt plaster is

Options

A. `CaSO_(4), 2H_(2)O`
B. `MgSO_(4).7H_(2)O`
C. `CaSO_(4).1//2H_(2)O`
D. `CaSO_(4)`

Answer

D

Explanation

When heated to about `200^(@)C` plaster of paris of gypsum is converted into anhydrous calcium sulphate which is known as dead burnt plaster becuae it does not set like plaster of paris when moistened with water.
`underset("Plaster of paris")(CaSO_(8)). 1/2 H_(2)O overset(28^(@)C)(to)underset("Dead burnt plaster")(CaSO_(2))+1/2H_(2)O`