Advertisements
Advertisements
Question
For the substance given below, describe the role played in the extraction of aluminium.
Graphite
Solution
- Thick rods of graphite are suspended in the fused electrolyte.
- They act as an anode where oxygen gas is discharged.
APPEARS IN
RELATED QUESTIONS
Explain why In the electrolysis of alumina using the Hall Heroult's Process the electrolyte is covered with powdered coke
For cryolite, explain its significance in the extraction of aluminium.
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 middle region of the blast furnace.
The following question relate to the extraction of aluminium by electrolysis.
Explain why is it necessary to renew the anode periodically.
Explain why :
Iron sheets are coated with zinc during galvanization.
Name the alloy used for the following purpose.
Making parts of watches
Name a metal which is found abundantly in the Earth's crust.
In Hall and Heroult's process, products liberated at anode and cathode are ______
Given below in column A is a schematic diagram of the electrolytic reduction of alumina. Identify the parts labelled as A, B and C with the correct options from the Column B.
| column A | column B | |
 |
1. | Platinum |
| 2. | Anode | |
| 3. | Cathode | |
| 4. | Electrolyte mixture | |
| 5. | Bauxite |
