Medium
The incorrect statement about the Hall$-$Heroult process is:
- ACarbon anode is oxidised to $CO$ and $CO_2$.
- B$Na_3AlF_6$ helps to decrease the melting point of the electrolyte.
- C$CaF_2$ helps to increase the conductivity of the electrolyte.
- DOxidation state of oxygen changes in the overall cell reaction.
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