Chemistry General Principles And Process of Isolation of Elements

The incorrect statement about Hall - Heroult process is :

1

Carbon anode is oxidised to CO and CO₂

2

Na₃AlF₆ helps to decrease the melting point of the electrolyte

3

CaF₂ helps to increase the conductivity of the electrolyte

4

Oxidation state of oxygen changes in the overall cell reaction

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