Q. 85.0( 4 Votes )

In the metallurgy A. Al3+ is oxidised to Al (s).

B. graphite anode is oxidised to carbon monoxide and carbon dioxide.

C. oxidation state of oxygen changes in the reaction at anode.

D. oxidation state of oxygen changes in the overall reaction involved in the process.

Answer :

The following reactions happen during the metallurgy of aluminium at anode where oxidation takes place.

C(s) + O2 (melt) CO(g) + 2e


C(s) + 2O2 (melt) CO2 (g) + 4e


At cathode


Al3+ (melt)+3e-Al(s)


Overall Reaction:


2Al2O3 +3C 4Al +3CO2


Solid carbon(graphite) gets oxidised to carbon monoxide and carbon dioxide.

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