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प्रश्न
In order to obtain 1 tonne of aluminium, the following inputs are required: 4 tonnes 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 (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
- Name the process used for the purification of bauxite.
- Write the equation for the action of heat on aluminium hydroxide.
उत्तर
- The process used for the purification of bauxite is Baeyer's process.
- The action of heat on aluminium hydroxide:
\[\ce{2Al(OH)3 ->[heat][1000^\circ C]Al2O3 + 3H2O}\]
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संबंधित प्रश्न
Write the equation for the reaction where the aluminum oxide for the electrolytic extraction of aluminum is obtained by heating aluminum hydroxide.
For cryolite, explain its significance in the extraction of aluminium.
| Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction. |
Name a chemical used for dissolving aluminium oxide. In which state is the chemical used?
How is aluminium obtained from pure ore?
For the substance listed below, explain its role in the extraction of aluminium: Sodium hydroxide
For the substance listed below, explain its role in the extraction of aluminium: Cryolite
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.
Describe the role played in the extraction of aluminum : Graphite
Explain why :
Iron sheets are coated with zinc during galvanization.
The compound that is not a constituent of the electrolytic mixture used in Hall-Heroult's process is ______.
