In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

C O

and

C O_{2}

are produced in this process

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$A l_{2} O_{3}$ is mixed with $C a F_{2}$ , which lowers the melting point of the mixture and brings conductivity

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$A l^{3 +}$ is reduced at the cathode to form $A l$

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$N a_{3} A l F_{6}$ serves as the electrolyte

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Solution

The correct option is D
$N a_{3} A l F_{6}$ serves as the electrolyte

Since carbon electrodes are used, $C O$ and $C O_{2}$ are formed. In any cell - be it electrolytic or Galvanic - oxidation happens at the anode.
so clearly, the reduction of $A l^{3 +}$ to $A l$ happens at the cathode. Also, concentrated $A l_{2} O_{3}$ is mixed with $C a F_{2}$ , which lowers the
melting point of the mixture and enhances conductivity.

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C O_{2}

A l_{2} O_{3}

C a F_{2}