Which statement is false with respect to the extraction process of aluminum.

Reaction of sodium aluminate with carbon dioxide:

$2{\mathrm{NaAlO}}_2+{\mathrm{CO}}_2+3{\mathrm{H}}_2\mathrm{O}\to 2\mathrm{Al}{\left(\mathrm{OH}\right)}_3+{\mathrm{Na}}_2{\mathrm{CO}}_3$

Alumina is a bad conductor of electricity and has a high melting point. To overcome this issue, fluorspar (CaF₂)and cryolite (Na₃AlF₆) is added to alumina which increases its conductivity and reduces its melting point.

In the Hall’s process, anode is made up to carbon where oxygen liberated and forms CO and CO₂.

$$\begin{gathered} \mathrm{C}+{\mathrm{O}}^{2-}\to \mathrm{CO}+2{\mathrm{e}}^{-} \\ \mathrm{C}+2{\mathrm{O}}^{2-}\to {\mathrm{CO}}_2+4{\mathrm{e}}^{-} \end{gathered}$$