In order to obtain 1 tonne of aluminium, 4 tonnes of bauxite, 150 | Filo
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Class 12



General Principles and Processes of Isolation of Elements

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In order to obtain 1 tonne of aluminium, 4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite is required. 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.
(i) Write the formulae of cryolite.
(ii) Write down the word which correctly completes the following sentence.
By dissolving aluminium oxide in cryolite a ____ (conducting/ non conducting)  solution is produced.
(iii) Why is so much graphic required for the electrolytic process?
(iv) Write the equation for the reaction which takes place at cathode.

Solution:  (i) The formula of the cryolite is .
 (ii) Conducting
 (iii) In electrolytic process, the graphite acts as anode. The anode has to be replaced from time to time as it gets oxidized by the oxygen evolved at the anode.
 (iv) The reaction that occurs at cathode is: 
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general principles and processes of isolation of elements