What temperature will be required for the preparation of Plaster of Paris from gypsum?

Correct option is B

Sol: The correct answer is (b) 100°C

​Plaster of Paris is prepared by heating gypsum to a specific temperature. Gypsum is calcium sulfate dihydrate $$(CaSO_4 . 2H_2O)$$ and when it is heated, it loses water molecules to form Plaster of Paris.​

Key Points:

Preparation:

​$$_4 ⋅ 2 _2 (Gypsum) → 373 ( 4 ) ⋅ \frac{1} {2}_2 (Plaster of Paris) + \frac{3}{2} _2$$

​​Required Temperature:

• The temperature required for the preparation of Plaster of Paris from gypsum is around 373 K (which is approximately 100°C).
• This process involves heating gypsum to about 373 K to drive off part of the water of crystallization, resulting in the formation of Plaster of Paris.