Which statement is incorrect regarding the Ha | vedclass

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(D) In the Hall-Heroult process for the extraction of aluminium from alumina $(Al_2O_3)$,the following reactions occur:At the cathode: $Al^{3+} + 3e^-

Vedclass · Accepted Answer

$4$

Vedclass · Answer

(D) In the Hall-Heroult process for the extraction of aluminium from alumina $(Al_2O_3)$,the following reactions occur:At the cathode: $Al^{3+} + 3e^- \rightarrow Al(l)$At the anode: $C(s) + O^{2-} \rightarrow CO(g) + 2e^-$ and $C(s) + 2O^{2-} \rightarrow CO_2(g) + 4e^-$Statements $(1)$,$(2)$,and $(3)$ are correct: Cryolite $(Na_3AlF_6)$ is added to $Al_2O_3$ to lower its melting point and increase electrical conductivity. $A$ steel vessel with a carbon lining acts as the cathode,and graphite rods act as the anode.Statement $(4)$ is incorrect because $CO_2$ gas is generated at the anode due to the oxidation of the carbon rods,not at the cathode.

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