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Is it true that under certain conditions...

Is it true that under certain conditions Mg can reduce `Al_(2)O_(3)` and Al can reduce MgO ? What are those conditions?

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Yes, below `1350^(@)C` Mg can reduce `Al_(2)O_(3)` and above `1350^(@)C,` Al reduce MgO. This can be inferred from `DeltaG^(Theta)` vs T plots.
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