Question

Name the following :
(i) A metal which is liquid at room temperature.
(ii) A compound added to lower the fusion temp. of the electrolytic bath in the extraction of Al.
(iii) The process of heating an ore to a high temperature in the presence of air.

  • Metallurgy
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Answer

(i) Mercury is liquid at room temperature.

(ii) Cryolite [Na3AlF6] is added to lower the fusion temp, of the electrolytic bath in the extraction of Al

(iii) Roasting is the process of heating an ore to a high temperature in the presence of air.

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Metallurgy

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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