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प्रश्न
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.
(i) Name the process used for purification of bauxite.
(ii) Write the equation to show the action of heat on aluminium hydroxide.
उत्तर
(i) Baeyer's process or Hall's process is used for the purification of bauxite.
(ii ) \[\ce{2Al(OH)3 + Heat -> Al2O3 + 3H2O}\]
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संबंधित प्रश्न
Explain why In the electrolysis of alumina using the Hall Heroult's Process the electrolyte is covered with powdered coke
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?
Name the following:
The chief ore of aluminium.
Why is food containing iron salts should not be cooked in aluminium utensils?
For the substance listed below, explain its role in the extraction of aluminium: Bauxite
Write balanced equation for the following reaction:
Aluminium powder is warmed with hot and concentrated caustic soda solution.
Name the following :
A compound added to lower the fusion temperature of electrolytic bath in the extracton of aluminium.
Write the equation for the reaction where the aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide.
Name the alloy used for the following purpose.
Surgical instruments
In Hall and Heroult's process, products liberated at anode and cathode are ______
