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Question

Sketch shown is of an electrolytic cell used in the extraction of aluminium:

What is the substance of which the electrode A is made?

A

Graphite

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B

Diamond

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C

Iron

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D

Aluminium

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Solution

The correct option is A Graphite
The diagram shows an aluminium oxide electrolysis cell. Both the negative electrode (cathode) and positive electrode (anode) are made of graphite, a form of carbon.

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Q. The following is a sketch of an electrolytic cell used in the extraction of aluminium:
Figure

(a) What is the substance of which the electrodes A and B are made?
(b) At which electrode (A or B) is the aluminium formed?
(c) What are the two aluminium compounds in the electrolyte C?
(d) Why is it necessary for electrode B to be continuously replaced?

The diagram shows the sketch of an electrolytic cell used in the extraction of aluminium. At which electrode (A or B) is the aluminium formed?

The diagram shows the sketch of an electrolytic cell used in the extraction of aluminium. What are the two aluminium compounds present in the electrolyte C?

The diagram given below shows an electrolytic cell used in the extraction of aluminium:\

Why is it necessary for electrode B to be continuously replaced?

It necessary for electrode B to be continuously replaced.

Reason: At the positive anode, oxygen gas is formed and at high temperature of the electrolysis cell it burns and oxidises away the carbon electrodes to form toxic carbon monoxide or carbon dioxide.

[Note : Sketch shown is of an electrolytic cell used in the extraction of aluminium]

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