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प्रश्न
For the substance listed below, explain its role in the extraction of aluminium: Cryolite
उत्तर
Cryolite is used in the electrolysis of alumina. The function of cryolite is to
(1) Reduce melting point of alumina
(2) Make molten alumina a good conductor of electricity.
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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.
- 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?
How is ore purified (give equations also)
In the Hall's process for extraction of aluminium, Give the formula and purpose of fluorspar and cryolite
In the Hall's process for extraction of aluminium, Sate the location of cathode and anode and explain what occurs at each electrode.
Aluminium is a more active metal than iron, but suffers less corrosion. Why?
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.
In construction work, why is the alloy of aluminium, duralumin used rather than pure aluminium.
Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.
Name a metal which is found abundantly in the Earth's crust.
Fused alumina is reduced to aluminium by electrolytic reduction, since ______.
