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

(A) the carbon anodes get decayed 

(B) the carbon prevents atmospheric oxygen from coming in contact with aluminium 

(C) Oxygen liberated at the carbon anodes reacts with anodes to form CO and CO

(D) Carbon converts Al2O3 to Al 

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(C) Oxygen liberated at the carbon anodes reacts with anodes to form CO and CO2.

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