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Extraction of Aluminium

During the el...

Question

During the electrolytic reduction of alumina, which of the following element is deposited at the cathode?

A

Oxygen

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B

Graphite

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C

Carbon dioxide

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D

Aluminium

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Solution

The correct option is D
Aluminium

Aluminium is produced by the electrolytic reduction of fused alumina $(A l_{2} O_{3})$ in the electrolytic cell. Aluminium is deposited at the cathode and oxygen gas is liberated at the anode. Oxygen combines with graphite to form $C O_{2}$ .

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(i) Copper is extracted by hydrometallurgy from low-grade ores.
(ii) In the electrolytic reduction of alumina, graphite is acting as an anode and steel vessel with the lining of carbon acts as an anode.
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C O_{2}

are produced at the cathode.

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(ii) Write the equation for the reaction where the aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide.
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(v) Explain why it is preferable to use a number of graphite electrodes as anode instead of a single electrode, during the above electrolysis.

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