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The element which could be extracted by electrolytic reduction of its oxide dissolved in a high temperature melt is:

1. sodium
2. magnesium
3. flourine
4. aluminium

Correct answer: aluminium

Solution

Aluminium is extracted by electrolytic reduction of alumina dissolved in a high-temperature molten electrolyte. This works because aluminium is too reactive to be obtained by ordinary chemical reduction, so electrolysis is used instead.

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