Question

An aqueous solution of Al2O3 is electrolysed. Name the element collected anode.

Answer 1

Electrolysis of aqueous solution of $Al_2O_3$ yields oxygen gas at anode and pure aluminium at the cathode.

Explanation:

• The type of reaction in which the chemical compounds are decomposed through electric current is called electrolysis.
• During electrolysis of $Al_2O_3$, at cathode reduction occurs whereas at the anode oxidation occurs.The overall reaction involved in the electrolysis process is as follows:

$2Al_2O_3\rightarrow 4Al+3O_2$

• The reaction involved in the cathode region and anode region during electrolysis of $Al_2O_3$ is as follows:

At cathode:

$Al^{3+}+3e^-\rightarrow Al$ (Reduction)

At anode:

$2O^{2-}\rightarrow O_2+4e^-$ (Oxidation)

• From the above equation it is inferred that, at anode, element oxygen is collected in the form of gas.

Learn more about such concept

Sketch the cell for the electrolysis of molten NaCl. Indicate cathode, anode and their signs. Show the flow of electrons and ions.

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What does the amount of metal deposited during electrolysis depend upon?

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Answer 2

Explanation:

• In the electrolysis of molten alumina, Na3 AlF6 or CaF2 is added to pure alumina to lower the melting point and to increase the conductivity of the electrolyte.
• Here oxygen gas is liberated at the anode, while aluminium is collected at the anode