In order to obtain 1 tonne of aluminium, 4 tonnes of bauxite, 150 | Filo
filo Logodropdown-logo

Class 12

Chemistry

Metallurgy

General Principles and Processes of Isolation of Elements

view icon544
like icon150

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: 
view icon544
like icon150
filo banner image

Connecting you to a tutor in 60 seconds.

Get answers to your doubts.

playstore logoplaystore logo
Similar Topics
general principles and processes of isolation of elements