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During the electrolytic reduction of aluminium, the carbon anodes are replaced from time to time because:

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the carbon prevents atmospheric oxygen from coming in contact with aluminium

the carbon anodes get decayed

oxygen liberated at the carbon anodes reacts with anodes to form CO and ${CO}_{2}$

carbon converts ${Al}_{2} O_{3}$ to Al

answer is C.

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Detailed Solution

During the electrolytic reduction of aluminum, the carbon anodes are replaced from time to time because oxygen liberated at the carbon anodes reacts with anodes to form CO and . ${CO}_{2}$

When alumina is electrolyzed, the oxygen released at the carbon anode interacts with the graphite rods to produce carbon dioxide.

During the electrolysis of alumina, the anodes constantly erode as they get oxidized. Consequently, it is occasionally essential to replace anodes.

Hence Correct option is C

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