Question

A to F below relate to the source and extraction of either Zinc or aluminium
A : Bauxite,
B : Coke,
C : Cryolite,
D : Froth floatation,
E : Sodium hydroxide solution,
F : Zinc blended.

(i) Write down the three letters each from the above list which are relevant to – Aluminium.
(ii) Fill in the blanks using the most appropriate words from A to F :
(a) The ore from which aluminium is extracted must first be treated with …………… so that pure Aluminium oxide can be obtained.
(b) Pure Aluminium oxide is dissolved in …………… to make a conducting solution.
(iii) Write the formula of Cryolite.

  • Metallurgy
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Answer

(i) A : Bauxite and C : Cryolite are ores of aluminium. E : Sodium hydroxide solution is used in the dressing of the ore.

(ii) Fill in the blanks :

(a) The ore from which aluminium is extracted must first be treated with sodium hydroxide solution so that pure Aluminium oxide can be obtained.

(b) Pure Aluminium oxide is dissolved in Cryolite to make a conducting solution

(iii) Na3AlF6 — formula of Cryolite

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Give reasons for the following pertaining to Hall Herault’s process.
(i) The fusion temperature of the electrolyte has to be lowered before conducting the electrolytic reduction.
(ii) The constituents of the electrolyte in addition to one part of fused alumina contains three parts of cryolite and one part of fluorspar.
(iii) A layer of powdered coke sprinkled over the electrolytic mixture, protects the carbon electrodes.
(iv) It is preferred to use a number of graphite electrodes as anode, instead of a single graphite electrode.

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