Question

Write the name of a different stage of obtaining pure metal from its ore. Explain refining of copper by electrolysis with a diagram.

Answer 1

The name of a different stage of obtaining pure metal from its ore is Bessemerization.

Refining of copper by electrolysis:

Anode is a strip of impure copper metal. Cathode is a strip of pure copper metal. Electrolyte is copper sulphate solution. On passing current, pure copper (from anode) dissolves in the electrolyte. An equivalent quantity of pure copper (from the electrolyte) is deposited on cathode. Soluble impurities remain dissolved in the electrolyte and insoluble impurities get deposited at the bottom of anode as anode mud.

Anode : $Cu\to C{u}^{2+}+2e^{-}$
Cathode : $C{u}^{2+}+2e^{-}\to Cu$