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Extraction of Aluminium

The electroly...

Question

The electrolytic cell for alumina is given above.
Anode is replaced from time to time while producing aluminium. Why ?

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Solution

Oxygen liberated at the anode reacts with carbon , forming CO, creating holes at anode. So, anode is replaced from time to time while producing aluminium.

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Explain with reasons:

(a) In the electrolytic reduction of alumina, the graphite anode is gradually consumed.

or

Why the anode has to be replaced in this process?

(b) Roasting is carried out on sulphide ores and not on carbonate ores.

(c) Carbon can reduce lead oxide but not aluminium oxide.

(d) Electrolytic reduction is done to obtain aluminium?

(e) Why 'the food containing iron salts' should not be cooked in aluminium utensils?

Q. In the extraction of aluminium ;
(i) name the process of concentration of bauxite.
(ii) write the cathode reaction in electrolytic reduction of alumina.
(iii) write the function and chemical formula of cryolite.
(iv) write a chemical equation for the action of heat on aluminium hydroxide.
(v) why is it necessary to replace anodes time to time?

Q. Explain the method of obtaining pure aluminium from alumina by electrolysis . In this process , the carbon rods are replaced from time to time. Why ?

Q. Draw labelled diagram of Hall-Heroult Electrolytic cell for the extraction of aluminium. Write anode and cathode reactions.

Q. For the effective extraction of aluminium, the carbon anodes are to replaced from time to time. Justify.

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