Question

In electrometallurgy of aluminium, what will happen if graphite rods are not used as anode and are replaced by some other metal?

• A. $O_2$ liberated at anode will react with aluminium to give back $A{l}_2{O}_3$.
• B. $F_2$ will be liberated at anode instead of $O_2$.
• C. The process of electrometallurgy will become non-spontaneous.
• D. Aluminium oxide splits into $A{l}^{3+}$and $O^{2-}$ ions only in presence of graphite.

Answer 1

The correct option is A $O_2$ liberated at anode will react with aluminium to give back $A{l}_2{O}_3$.

If some other metal is used as the anode other than Graphite then the Oxygen liberated at the anode will convert some $Al$ to ${Al}_2{O}_3$