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Which of the following are not the correct statements about the extraction of aluminum?
I. The electrolyte is purified $A l_{2} O_{3}$ containing $N a_{3} A l F_{6}$
II. Cathode is graphite
III. Aluminum is formed at cathode
IV. Steel vessel with lining of carbon is anode

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I & III only

I & IV only

II & III only

II & IV only

answer is D.

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Detailed Solution

I. The electrolyte is purified $A l_{2} O_{3}$ containing $N a_{3} A l F_{6}$
II. Cathode is aode
III. Aluminum is formed at cathode
IV. Steel vessel with lining of carbon is cathode.

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