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प्रश्न
Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Write an equation for the reaction which takes place at the anode during the extraction of aluminium by the electrolytic process.
उत्तर
At anode:
\[\ce{6O^{2-} - 12e^- -> 6[O]}\]
\[\ce{3[O] + 3[O] -> 3O2}\]
Anode is oxidised to carbon monoxide, which further forms carbon dioxide.
\[\ce{2C + O2 -> 2CO}\]
\[\ce{2CO + O2 -> 2CO2}\]
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संबंधित प्रश्न
For the substance given below, describe the role played in the extraction of aluminium.
Cryolite
What is the role of cryolite (NaAlF6) in the electrolytic reduction of alumina in the Hall's process?
An aqueous solution of sodium chloride is not used for electrolytic reduction of sodium metal. Why?
For the substance listed below, explain its role in the extraction of aluminium: Graphite
In order to obtain one tone of aluminium, the following inputs are required:
4 tones of bauxite, 150 Kg of sodium hydroxide and 600 Kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
(i) Name the process used for purification of bauxite.
(ii) Write the equation to show the action of heat on aluminium hydroxide.
The following question relate to the extraction of aluminium by electrolysis.
Explain why is it necessary to renew the anode periodically.
Write the equation for the reaction that occurs at the cathode during the extraction by aluminium by electrolysis.
Name the alloy used for the following purpose.
Making medals
The compound that is not an ore of aluminum is ______.
The compound that is not a constituent of the electrolytic mixture used in Hall-Heroult's process is ______.
