In the context of the Hall-Heroult process for the extreaction of Al

Question:

In the context of the Hall-Heroult process for the extreaction of Al, which of the following

statements is false ?

  1. $\mathrm{Al}^{3+}$ is reduced at the cathode to form $\mathrm{Al}$

  2. $\mathrm{Na}_{3} \mathrm{AlF}_{6}$ serves as the electrolyte

  3. $\mathrm{CO}$ and $\mathrm{CO}_{2}$ are produced in this process

  4. $\mathrm{Al}_{2} \mathrm{O}_{3}$ is mixed with $\mathrm{CaF}_{2}$ which lowers the melting point of the mixture and brings conductivity


Correct Option: , 2

Solution:

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