Question

how is copper obtained from its sulphide Ore give equation of the reaction

Answer 1

When sulfide ore is heated in the presence of air, it converts sulfide ore into copper oxide, and it leaves SO2. Again when the copper oxide is heated, it gets reduced to copper. Finally, pure copper will be obtained by the electrolysis process. 

Heat 
2CuS + 3O2 2Cu2O + 2SO2 

 Heat 
2CU2O + 3O2 6CU + SO2 
At Cathode: 
Cu2+ (aq) + 2e- Cu 
At Anode: 
Cu Cu2+ (aq) + 2e-

Answer 2

First the sulphide ore is heated in the presence of air to give Copper Oxide. This process is known as ROASTING OF ORE. Since Cu is higher up in the reactivity series, it gives oxides on roasting.

2CuS + 3O2 —> 2CuO + 2SO2

The Copper Oxide is now heated to give impure Copper.

2CuO + 3O2 —> 6Cu + SO2

Finally, the impure Copper is refined by ELECTROLYSIS. The impure Copper Metal is made the anode of an eloctrolytic cell and a thin strip of pure Copper is used as the cathode. On passing electric current, Copper is dissolved from anode and deposited on the cathode. The impurities collect at the bottom below the anode which is known as anode mud.

At cathode: Cu^2+ + 2e —> Cu

At anode: Cu - 2e —> Cu^2+