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The s-block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe s-block Elements1 Mark
Question
What is dead burnt plaster? How is it obtained?
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Answer

Dead burnt plaster is anhydrous $\mathrm{CaSO}_4$. It is obtained by heating plaster of Paris.
$\text{CaSO}_4\cdot\frac{1}{2}\text{H}_2\text{O}\xrightarrow{450\text{K}}\text{CaSO}_4+\frac{1}{2}\text{H}_2\text{O}\\ \text{Plaster of paris}\ \ \ \ \ \ \ \ \ \ \ \text{Dead burnt}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{plaster}$

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