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In the electrolytic extraction of aluminium, the solvent is

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molten ${Al}_{2} O_{3}$

water

${Fe}_{2} O_{3} + Al$

molten cryolite

answer is D.

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Detailed Solution

In the extraction of aluminium by electrolytic process, alumina ${Al}_{2} O_{3}$ is used along with fluorspar and cryolite. Cryolite reduces the melting temperature of the mixture, and also act as solvent to help dissolve ${Al}_{2} O_{3}$ .

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