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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
Answer the following questions with respect to the electrolytic process in the extraction of aluminum:
Explain why powdered coke is sprinkled over the electrolytic mixture.
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.
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.
- Write the formula of cryolite.
- Write down the word which correctly completes the following sentence.
By dissolving aluminium oxide in cryolite, a ______ (conducting/non-conducting) solution is produced. - Why is so much graphite required for the electrolytic process?
- Write the equation for the reaction which takes place at the cathode.
- What is cathode made up of?
Explain the following:
In construction work, why is the alloy of aluminium-duralumin used rather than pure aluminium?
Give reason for the following:
Extraction of aluminium was very difficult in the beginning.
In the Hall's process for extraction of aluminium, Give the formula and purpose of fluorspar and cryolite
The following question relate to the extraction of aluminium by electrolysis.
Explain why is it necessary to renew the anode periodically.
Describe the role played in the extraction of aluminum:
Sodium hydroxide
Explain the reason:
Why 'food containing iron salts' should not be cooked in aluminium utensils?
Name the alloy used for the following purpose.
Surgical instruments
