CHEMICAL INDUSTRIES
CHEMICAL INDUSTRY: Chemical industry is defined as one that uses chemistry to make chemicals from other chemical substances (raw materials) The important raw materials used in chemical industry include (i) air (ii) CaCO 3 (iii) Sea water and rock salt (iv) Sulphur (v) Metallic mineral ore (vi) Coal (vii) Natural gas and petroleum. SOURCES OF RAW MATERIALS IN CHEMICAL INDUSTRY AIR: Air is the chief source of O 2 and N 2 . N 2 is important because it is used in the manufacture of NH 3 . NH 3 itself is used in the manufacture of trioxonitrate (v) acid which is used in the making of explosives, plastics and other materials. NH 3 is also used in the manufacture of NH 4 + salts like HN 4 O 3 , (NH 4 ) 2 SO 4 which are used in manufacturing fertilizers. CALCIUM TRIOXOCARBONATE (iv) (CaC0 3 ): CaCO 3 in the form of lime stone, chalk and marble is the source of lime or calcium oxide which is used for mak...