Question

(a) What is gypsum ? What happens when gypsum is heated to 100°C (373 K) ?

(b) Name a sodium compound which is used for making borax and glass.

(c) Name the compound which is used in hospitals for setting fractured bones.

(d) Which is the real bleaching agent present in bleaching powder ?

Answer 1

(a) Gypsum is calcium sulphate dihydrate, CaSO₄ .2H₂O. When gypsum is heated to a temperature of 100?C, it loses 3/4th of its water of crystallisation and forms plaster of Paris.

(b) Sodium carbonate.

(c) Plaster of Paris.

(d) Chlorine.