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प्रश्न
Explain with reason:
In the electrolytic reduction of alumina, the graphite anode is gradually consumed.
Explain with reason:
Why the anode has to be replaced from time to time in this process?
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उत्तर
In the electrolytic reduction of alumina, the graphite (anode) is oxidised by oxygen to CO and further forms CO2, so it is consumed and has to be replaced from time to time.
\[\ce{2C + O2 -> 2CO}\]
\[\ce{2CO + O2 -> 2CO2}\]
संबंधित प्रश्न
Complete the following by selecting the correct option from the choices given:
The metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction ____________. (Fe/Mg/Pb/Al)
How is the following metallic oxide reduced? Write equations:
Iron (ll) oxide
Write a balanced chemical equation for each of the following reactions :
(i) Reduction of copper (II) oxide by hydrogen
Give reason for the following:
Carbon anodes are used in the electrolytic extraction of aluminium.
Name oxide of one metal which is reduced by (give equation): Electrolytic reduction
For the reaction of a metal oxide. Suggest a reducing agent other than carbon
Give the chemical name and formula of 'cryolite'
Name a non-metallic element which is a conductor of electricity.
Write balanced equation for the following reaction:
Reduction of copper oxide by hydrogen.
Give the equations for the reduction of copper oxide.
