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Chemistry Question on General Principles and Processes of Isolation of Elements

In the metallurgy of aluminium

A

Al3+Al^{3+} is oxidised to Al(s)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

graphite anode is oxidised to carbon monoxide and carbon dioxide

Explanation

Solution

In metallurgy of aluminium, the oxidation state of OO does not change in either the reaction occurring at the anode or overall reaction. C+O−2→C+2+O−2+2e−C + \overset{-2}{O} \to \overset{+2}{C} + \overset{-2}{O} + 2e^- C+2O−2→C+4+(O−2)2C + 2\overset{-2}{O} \to \overset{+4}{C} + (\overset{-2}{O})_2 Al2O3+3C→2Al+3C+2+3O−2Al_2O_3 + 3C \to 2Al + \overset{+2}{3C} + \overset{-2}{3O}