Which of the following compound is called dead burnt plaster?

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${CaSO}_{4} \cdot 2 H_{2} O$

${CaSO}_{4} \cdot \frac{1}{2} H_{2} O$

${CaSO}_{4}$ (anhy)

None of these

answer is C.

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Detailed Solution

Explanation

The compound known as dead burnt plaster is anhydrous calcium sulfate, with the chemical formula CaSO₄.

This form is produced by heating plaster of Paris (calcium sulfate hemihydrate, CaSO₄·½H₂O) at temperatures above 393 K (120°C), causing it to lose its water of crystallization and become anhydrous.

Among the options provided:

a) CaSO₄·½H₂O: This is the formula for plaster of Paris, not dead burnt plaster.
b) CaSO₄·2H₂O: This represents gypsum, the dihydrate form of calcium sulfate.
c) CaSO₄ (anhydrous): This is the correct formula for dead burnt plaster.

Therefore, the correct answer is (c) CaSO₄ (anhydrous).

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