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प्रश्न
Fused alumina is reduced to aluminium by electrolytic reduction, since ______.
पर्याय
Alumina is highly stable
Alumina is least stable
Alumina is not reduced by drying agents.
Alumina is not reduced by reducing agents.
उत्तर
Fused alumina is reduced to aluminium by electrolytic reduction, since Alumina is highly stable.
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संबंधित प्रश्न
For sodium hydroxide, 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.
- 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?
The reason for using Aluminium in the alloy duralumin is ______.
Give reason for the following:
Extraction of aluminium was very difficult in the beginning.
How is aluminium obtained from pure ore?
In the Hall's process for extraction of aluminium, Sate the location of cathode and anode and explain what occurs at each electrode.
Answer the following question :
Name a metal which is found abundantly in earth's crust.
The following question relate to the extraction of aluminium by electrolysis.
Explain why is it necessary to renew the anode periodically.
Explain why :
In the electrolysis of alumina using the Hall Heroult's Process the electrolyte is covered with powdered coke.
