Question

Chemical formula of Gypsum is ______.

Options

• \[\ce{CaSO4. 1/2 H2O}\]

• CaSO₄.2H₂O

Answer 1

Chemical formula of Gypsum is CaSO₄.2H₂O.

Explanation:

Gypsum is a naturally occurring mineral composed of calcium sulphate bound to two molecules of water of crystallisation. When it is heated to about 373 K (100°C), it loses three-fourths of its water content to form plaster of paris. Conversely, mixing plaster of paris with water sets it back into a hard, solid mass of gypsum.