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Give reasons for the following – pertaining to Hall Herault’s process.The constituents of the electrolyte in addition to one part of fused alumina contains three parts of cryolite and one part of fluorspar. |
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Answer» The reasons for addition of mainly cryolite [in a higher ratio] and fluorspar to the electrolytic mixture are : (a) They lowers the fusion point of the mixture i. e. the mixture fuses [melts] around 950°C instead of 2050°C. (b) They enhances the mobility of the fused mixture by acting as a solvent for the electrolytic mixture. Thus cryolite in the molten state of subdivision dissolves aluminium oxide. (c) Addition of cryolite enhances the conductivity of the mixture. Since pure alumina is almost a non-conductor of electricity. |
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