Question

A graphite anode is preferred to other inert electrodes during electrolysis of fused lead bromide. explain.

Answer 1

Electrodes used in the process of electrolysis are either inert or active.
The electrodes used determine the ion preferred for discharge.
If inert electrodes like graphite are used, they will not take part in the electrolytic reaction.
 The electrolysis will thus depend only on the  two factors i.e. position in the electrochemical series and the concentration of ions.
The active electrodes like Cu, Ni, Ag, if used, take part in the electrolytic reaction and the product formed is different.

Answer 2

graphite anode is preferred to other inert electrodes during electrolysis of fused lead bromide because it is unaffected from the reactive bromine vapours