Question

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Describe the process of electrolysis of aluminium oxide and provide suitable chemical equations for the reactions at anode and cathode.
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Answer 1

We say that aluminium ions are reduced during electrolysis. Normally, we think of  

reduction as the removal of oxygen from a compound (see the unit Reduction of Metal Oxides by Carbon). But we can define it more generally in terms of electrons:

Reduction is the gaining of electrons.

At the  

cathode, each Al3+  

ion gains 3 electrons to form an aluminium  

atom. So the aluminium ions are reduced.

Al3+ + 3e−  Al

The chemical opposite of reduction is  

oxidation. Therefore:

Oxidation is the loss of electrons.

Oxidation always happens at the  

anode in electrolysis. In the case of the electrolysis of aluminium oxide:  

2O2− − 4e−  O2  

Here, the oxide ions, O2−, have been oxidized to form oxygen gas. This then reacts with the carbon anodes to form carbon dioxide gas.

You can remember this by thinking of the word 'OILRIG'. This stands for: Oxidation Is Loss, Reduction Is Gain (of electrons).

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Answer 2

here is ur ans with explanation and equation

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