Questions
In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false ?
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Correct option is D
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The fluorspar (CaF2) is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na3 AlF6 ). The role of fluorspar is/are
I. to decrease the rate of oxidation of carbon at anode.
II. to act as a catalyst.
III. to lower the temperature of the melt.
IV. to make the fused mixture very conducting.
Choose the correct statement(s).
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