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Question

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

A
CO and CO2 are produced in this process
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B

Al2O3 is mixed with CaF2, which lowers the melting point of the mixture and brings conductivity

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C

Al3+ is reduced at the cathode to form Al

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D

Na3AlF6 serves as the electrolyte

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Solution

The correct option is D

Na3AlF6 serves as the electrolyte


Since carbon electrodes are used, CO and CO2 are formed. In any cell - be it electrolytic or Galvanic - oxidation happens at the anode.
so clearly, the reduction of Al3+ to Al happens at the cathode. Also, concentrated Al2O3 is mixed with CaF2, which lowers the
melting point of the mixture and enhances conductivity.

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