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Dead burnt plaster is...

Dead burnt plaster is

A

`CaSO_(4)`

B

`CaSO_(4)(1)/(2)H_(2)O`

C

`CaSO_(4).H_(2)O`

D

`CaSO_(4).2H_(2)O`

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Plaster of Paris**: Plaster of Paris is chemically represented as CaSO4·1H2O. It contains calcium sulfate with one molecule of water of crystallization. 2. **Heating Plaster of Paris**: When Plaster of Paris is heated to a temperature of about 393 K (approximately 120°C), the water of crystallization (the 1H2O) is removed. This process is known as calcination. 3. **Result of Heating**: After heating, the remaining compound is calcium sulfate (CaSO4) without any water molecules attached to it. 4. **Identifying Dead Burnt Plaster**: The anhydrous form of calcium sulfate (CaSO4), which is obtained after the removal of water, is referred to as dead burnt plaster. 5. **Conclusion**: Therefore, dead burnt plaster is represented by the chemical formula CaSO4. **Final Answer**: Dead burnt plaster is CaSO4. ---
**Step-by-Step Solution:** 1. **Understanding Plaster of Paris**: Plaster of Paris is chemically represented as CaSO4·1H2O. It contains calcium sulfate with one molecule of water of crystallization. 2. **Heating Plaster of Paris**: When Plaster of Paris is heated to a temperature of about 393 K (approximately 120°C), the water of crystallization (the 1H2O) is removed. This process is known as calcination. 3. **Result of Heating**: After heating, the remaining compound is calcium sulfate (CaSO4) without any water molecules attached to it. ...
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