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Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
Explanation
Only a metal with more negative $\Delta G^\circ$ of oxide formation than Al (Mg) can reduce $Al_2O_3$.
Detailed Solution
The metal which is more reactive than 'Al' (whose oxide line lies below that of $Al_2O_3$ in the Ellingham diagram) can reduce alumina.
So Mg can be used to reduce alumina.