Engineering
Chemistry
Electrolytic Refining
Ellingham Diagram
Question

The carbon-based reduction method is NOT used for the extraction of

tin from SnO2

iron from Fe2O3

magnesium from MgCO3 · CaCO3

aluminium from Al2O3

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Solution

More electropositive metals like Al, Mg, Ca, Na are reduced by electrolytic reductions not by carbon reduction because they from carbides with them.