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How is carbon electrodes formed in an electrolytic aluminium smelting cell?

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How is carbon electrodes formed in an electrolytic aluminium smelting cell?

(a) From Alumina

(b) By Replacing the old electrodes

(c) From coke and carbon dioxide

(d) From coke and pitch

I got this question in examination.

Question is taken from Aluminum topic in division Metallurgical Industries of Chemical Technology

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The correct choice is (d) From coke and pitch

To explain: Carbon electrodes are formed continuously from coke and pitch. Pitch is a soft to hard and brittle coal substance.

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