KCET · Chemistry · s Block Elements
Dead burnt plaster is
- A \( \mathrm{CaSO}_{4} \)
- B \( \mathrm{CaSO}_{4} \cdot \frac{1}{2} \mathrm{H}_{2} \mathrm{O} \)
- C \( \mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O} \)
- D \( \mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O} \)
Answer & Solution
Correct Answer
(A) \( \mathrm{CaSO}_{4} \)
Step-by-step Solution
Detailed explanation
When gypsum is heated at temperature above \( 393 \mathrm{~K} \) than, there no water of crystallization is left and anhydrous calcium
sulphate \( \left(\mathrm{CaSO}_{4}\right) \) is formed. This is known as dead burnt plaster.
\[
\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O} \rightarrow \underset{\text { Gypsum }}{\mathrm{CaSO}_{4}}+2 \mathrm{H}_{2} \mathrm{O}
\]
sulphate \( \left(\mathrm{CaSO}_{4}\right) \) is formed. This is known as dead burnt plaster.
\[
\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O} \rightarrow \underset{\text { Gypsum }}{\mathrm{CaSO}_{4}}+2 \mathrm{H}_{2} \mathrm{O}
\]
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