Explain why it is preferable to use a number of graphite anodes instead of a single electrode during the electrolysis of aluminium.

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

Give reasons for the following - pertaining to Hall Herault's process. It is preferred to use a number of graphite electrodes as anode, instead of a single graphite electrode.

Why anode has to be replaced from time to time during the electrolysis of alumina?

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

Explain why : A layer of powdered coke is sprinkled on the surface of the electrolyte during the electrolysis of molten aluminium

Graphite is used for making electrodes.

The amount of an ion liberated on an electrode during electrolysis does not depend upon:

.......... gas is liberated at anode during electrolysis of water.

Explain why graphite is soft and can be used as a lubricant.