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प्रश्न
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
टीपा लिहा
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उत्तर
Oxygen gas is liberated at anode as :
\[\ce{O2- - 2e- -> [O] }\]
\[\ce{[O] + [O] -> O2}\]
The oxygen formed at anode oxidizes the carbon of the anode to carbon dioxide.
\[\ce{C + O2 -> CO2}\]
As a result the anode gets oxidized and it has to be replaced periodically.
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