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प्रश्न
State the relevant reason for the following:
Graphite anodes are continuously replaced during the electrolysis of alumina.
उत्तर
The oxidation process takes place at the anode. In this process, oxygen is released which oxidises the anode made up of graphite to carbon monoxide which further oxidises to give carbon dioxide. Therefore, the anode is needed to be replaced from time to time.
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संबंधित प्रश्न
For graphite, explain its significance in the extraction of aluminium.
Give reason for the following:
Aluminium oxide cannot be reduced by carbon.
Give reason for the following:
Extraction of aluminium was very difficult in the beginning.
Why is food containing iron salts should not be cooked in aluminium utensils?
For the substance listed below, explain its role in the extraction of aluminium: Graphite
Describe the role played in the extraction of aluminum:
Sodium hydroxide
Explain why :
In the electrolysis of alumina using the Hall Heroult's Process the electrolyte is covered with powdered coke.
Write the equation for the reaction where the aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide.
Name the alloy used for the following purpose.
Making medals
Answer the following question:
Write the chemical formula of one main ore of iron and aluminium.
