Question

(a) Solid sodium hydrogen carbonate is heated ?(b) Chlorine gas is passed through dry slaked lime (c) Gypsum is heated to a temperature of 373 K?

Answer 1

(a) Sodium carbonate is formed (b) lime becomes milky (c) when gypsum is heated to temperature of 373K then POP is formed(calcium sulphate hemihydrate)

Answer 2

(a)2NaHCO3 --------Heat----------> Na2CO3 +H2O+CO2

Sodium Carbonate is formed.

(b)Ca(OH)2 + Cl2 → CaOCl2 + H2O

Bleaching Powder is formed

(c)CaSO4 2H2O --- -373 K ------> CaSO4 ½ H2O + 3/2 H2O

Plaster of Paris will form