The dead burnt plaster is:

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${CaSO}_{4} {.2H}_{2} O$

${CaSO}_{4} .12 \frac{1}{2} H_{2} O$

${CaSO}_{4}$

$2 {CaSO}_{4} {.H}_{2} O$

answer is C.

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Detailed Solution

Explanation:

Dead burnt plaster, also known as Plaster of Paris in its non-hydrated form, is produced by heating gypsum (CaSO₄·2H₂O) at a high temperature, typically around 150°C. This process drives off the water of crystallization and leaves behind CaSO₄ (calcium sulfate).

Gypsum (CaSO₄·2H₂O) is the natural mineral form of calcium sulfate dihydrate.
When heated, the water molecules are removed, forming CaSO₄ (calcium sulfate), which is dead burnt plaster.

Other Options

CaSO₄·12H₂O: This is not a correct form of calcium sulfate. It does not represent dead burnt plaster.
2CaSO₄·H₂O: This refers to a different hydrated form of calcium sulfate, not the dead burnt plaster.

Therefore, the correct answer is CaSO₄.

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