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?

The electrode gets oxidized by the oxygen evolved at electrode B

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The electrode gets reduced by the hydrogen evolved at electrode B

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The electrode can explode on a long term use

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The electrode gets rusted and stops working

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Solution

The correct option is A
The electrode gets oxidized by the oxygen evolved at electrode B

The electrode B, made up of graphite, gets oxidized by oxygen released at the anode forming CO which further forms CO₂. Hence electrode B (anode) is replaced time to time.

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Similar questions

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?

Q. Assertion :

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]

During the high temperature non-aqueous electrolytic extraction of Aluminum from purified $A l_{2} O_{3}$ , the oxygen evolved at the anode reacts with the electrode (graphite). As a result the electrodes are periodically replaced. – True or False?

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?

Q. When current is passed through calculated water , the Hydrogen and Oxygen separates . The hydrogen gets accumulated on the negative electrode . Why does it not deposit on positive electrode?

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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?

The correct option is A The electrode gets oxidized by the oxygen evolved at electrode B The electrode B, made up of graphite, gets oxidized by oxygen released at the anode forming CO which further forms CO2. Hence electrode B (anode) is replaced time to time.

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?

The correct option is A
The electrode gets oxidized by the oxygen evolved at electrode B

The electrode B, made up of graphite, gets oxidized by oxygen released at the anode forming CO which further forms CO₂. Hence electrode B (anode) is replaced time to time.