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प्रश्न
Write the constituents of the electrolyte for the extraction of aluminium.
उत्तर
Constituents of the electrolyte for the extraction of aluminium are pure alumina (Al2O3), cryolite (Na3AlF6) and fluorspar (CaF2).
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संबंधित प्रश्न
Both brass and bronze contain copper as major constituents. Name other elements in these alloys.
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.
When bauxite is treated with sodium hydroxide solution, what happens to:
- the aluminium oxide,
- the iron (III) oxide?
Name the following:
The materials used as electrodes in the electrolytic extraction of aluminium.
The following is an extract from 'Metals in the Service of Man, Alexander and Street/Pelican 1976':
| 'Alumina (aluminium oxide) has a very high melting point of over 2000°C so that it cannot readily be liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance.' |
- Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide?
- The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the balanced chemical equation for this reaction.
- Name the element which serves both as the anode and the cathode in the extraction of aluminium.
- Write the balanced chemical equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.
- Give the balanced chemical equation for the reaction which occurs at the anode when aluminium is purified by electrolysis.
Name the solution used to react with bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer's process.
Name the following :
The compound formed by the reaction between calcium oxide and silica.
Name the alloy used for the following purpose.
Surgical instruments
Name the alloy used for the following purpose.
Aircraft
Fused alumina is reduced to aluminium by electrolytic reduction, since ______.
Write the balanced chemical equation to show the concentration of ore in Baeyer’s process.
Sodium aluminate to aluminium hydroxide
