Question

The anodes of carbon have to be changed in refining of aluminium.Give reasons for the given phenomena.

Answer 1

They get oxidised in the reaction

Answer 2

Dear Student,

◆ Carbon anodes have to be changed in aluminium refining because -

• In refining of aluminium from Alumina, Al metal is deposited at cathode and O2 gas is liberated at anode.
• O2 gas liberated at anode reacts with carbon. This slows down the refining process.
• Therefore, carbon anodes have to be changed periodically in aluminium refining.

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