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Question
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]
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]
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The molten aluminium sinks to the bottom of the cell, where it is tapped off. This oxygen reacts with the carbon of the positive electrodes, forming carbon dioxide, so they gradually burn away. As a result, the positive electrodes have to be replaced frequently. This adds to the cost of the process.
The molten aluminium sinks to the bottom of the cell, where it is tapped off. This oxygen reacts with the carbon of the positive electrodes, forming carbon dioxide, so they gradually burn away. As a result, the positive electrodes have to be replaced frequently. This adds to the cost of the process.
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