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प्रश्न
Name the alloy used for the following purpose.
Making medals
उत्तर
Bronze
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संबंधित प्रश्न
Write the equation for the reaction that occurs at the cathode during the extraction of aluminum by electrolysis.
Name three alloys of steel. Give their compositions and uses.
Name the following:
The substance added along with aluminium in the Hall-Heroult's process.
How is aluminium obtained from pure ore?
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.
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 following :
A compound added to lower the fusion temperature of electrolytic bath in the extracton of aluminium.
Name the compound formed when: Bauxite reacts with sodium hydroxide.
What impurities are present in aluminium ore?
