Answer: Electrolysis is defined as the process by which electrolyte allows electric current to pass through it and is decomposed in the process.
Step-by-step explanation:
Substances that allow the passage of electric current are known as conductors. Examples of conductors are metals, graphites. Metals are good conductors of electricity of which an example is LEAD.
Lead is a metal which can be extracted through the process of electrolysis. A substance in solution or liquid state like lead (II) bromide which allows electric current to pass through it and at the same time decompose by it is known as an ELECTROLYTE.
In the electrolysis of lead (II) bromide to obtain Lead,the electrolyte ionize into positive and negative ions. The positive ions migrate to the cathode and are known as captions. The negative ions migrate to the anode and are known as anions.
--> At the CATHODE: Pb2+ gains electrons and Lead is deposited
Pb2+(aq) + 2e -----> Pb(s)
--> At the anode: Br- gives up electrons and is liberated as bromine vapour.
2Br- (aq) ------> Br2(g) + 2e.