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It is true that under certain condition,...

It is true that under certain condition, Mg can reduce `Al_2O_3` and Al can reduce `MgO`? What are those conditions?

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If we look at the Ellingham diagram, it becomes evident that the plots for Al and Mg cross each other at `1350 .^(@)C` (1623 K). Below this temperature, Mg can reduce `Al_(2)O_(3)` and above this temperature, Al can reduce MgO.
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