Question

Which of the following is used in manufacturing chalks?

• A. Epsom
• B. Phenol
• C. Bee wax
• D. Plaster of Paris

Answer 1

The correct option is D Plaster of Paris

Plaster of Paris is a fine white powder of calcium sulphate hemihydrate. The chemical formula of Plaster of Paris is $CaS{O}_4.1/2H_{2}O$.

This is widely used for various purposes like:
$\bullet$ Building houses​
$\bullet$ Repairing cracked walls
$\bullet$ Setting fractured bones
$\bullet$ Manufacturing chalks