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प्रश्न
State the relevant reason for the following:
A layer of powered coke is used over the electrolytic mixture in Hall Heroult’s process.
उत्तर
A layer of powdered coke is used over the electrolytic mixture in Hall Heroult's process due to following reasons:
- It prevents the burning of the anode.
- It reduces heat loss by radiation.
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संबंधित प्रश्न
Answer the following questions with respect to the electrolytic process in the extraction of aluminum:
Identify the components of the electrolyte other than pure alumina and the role played by each
Name the following: A compound added to lower the fusion temperature of electrolytic bath in the extraction of aluminum
Name the constituents of Duralumin.
For sodium hydroxide, explain its significance in the extraction of aluminium.
In the Hall's process for extraction of aluminium, Give the formula and purpose of fluorspar and cryolite
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.
Write the equation for the reaction that occurs at the cathode during the extraction by aluminium by electrolysis.
Explain with reason:
A neutral gas other than oxygen is formed at the anode during the electrolysis of fused alumina.
Name the alloy used for the following purpose.
Surgical instruments
Write the balanced chemical equation to show the concentration of ore in Baeyer’s process.
Aluminium hydroxide to alumina
