Question

In the metallurgy of aluminium

• A. $\mathrm { Al } ^ { 3 + }$ is oxidized to
• B. Graphite anode is oxidized 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 1

Answer: (B)

Graphite anode is oxidized to carbon monoxide and carbon dioxide

Answer 2

The oxidation state of O does not change in either the reaction occurring at the anode or the overall reaction as shown below.

At anode:

At cathode : $\mathrm { Al } ^ { 3 + } + 3 \mathrm { e } ^ { - } \longrightarrow \mathrm { Al }$

Overall reaction :