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प्रश्न
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.
उत्तर
(i) Baeyer's process or Hall's process is used for the purification of bauxite.
(ii ) \[\ce{2Al(OH)3 + Heat -> Al2O3 + 3H2O}\]
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संबंधित प्रश्न
Name the constituents of Solder.
Name the constituents of Brass.
Give reason for the following:
Extraction of aluminium was very difficult in the beginning.
How is ore purified (give equations also)
How is aluminium obtained from pure ore?
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.
In construction work, why is the alloy of aluminium, duralumin used rather than pure aluminium.
Name the solution used to react with bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer's process.
Explain why it is preferably to use a number of graphite electrodes as anode instead of a single electrode, during the above electrolysis.
State the relevant reason for the following:
Graphite anodes are continuously replaced during the electrolysis of alumina.
Write the balanced chemical equation to show the concentration of ore in Baeyer’s process.
Aluminium hydroxide to alumina
