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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:
\[\ce{2Al(OH)3 ->[heat][1000^\circ C]Al2O3 + 3H2O}\]
APPEARS IN
संबंधित प्रश्न
Explain with reason:
Carbon can reduce lead oxide but not aluminium oxide.
Name the following:
The substance added along with aluminium in the Hall-Heroult's process.
In the Hall's process for extraction of aluminium, Give the formula and purpose of fluorspar and cryolite
For the substance listed below, explain its role in the extraction of aluminium: Bauxite
Aluminium is extracted from its chief ore bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Write three balanced equations for the purification of bauxite by Hall's process.
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 chemicals used for dissolving aluminium oxide. In which state of sub-division is the chemical used?
Aluminium is extracted from its chief ore bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Write an equation for the reaction which takes place at the anode during the extraction of aluminium by the electrolytic process.
Describe the role played in the extraction of aluminum:
Sodium hydroxide
Explain why :
In the electrolysis of alumina using the Hall Heroult's Process the electrolyte is covered with powdered coke.
Explain with reason:
A neutral gas other than oxygen is formed at the anode during the electrolysis of fused alumina.
