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Is it true that under certain conditions...

Is it true that under certain conditions, Mg can reduce `SiO_2` and Si canreduce MgO? What are those conditions?

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Yes, below `1350^@C` Mg can reduce `Al_2O_3` and above `1350^@C` , Al can reduce MgO. This can be inferred from `DeltaG^@` Vs T plots (Fig)
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