6.4 Is it true that under certain conditions, Mg can reduce Al2O3 and Al can reduce MgO? What are those conditions?

Below 1683K, the melting point of silicon, the Δ _fG^o curve for the formation of SiO₂ lies above the Δ _fG^o curve for MgO, so, at temperature below 1683 K, Mg can reduce SiO₂. On the other hand, above 1683 K, the Δ_fG^o curve for MgO lies above Δ_fG^o curve for SiO₂. Hence, at a temperature above 1683 K, Si can reduce MgO to Mg.

<p>Below 1683K, the melting point of silicon, the Δ _fG^o curve for the formation of SiO₂ lies above the Δ _fG^o curve for MgO, so, at temperature below 1683 K, Mg can reduce SiO₂. On the other hand, above 1683 K, the Δ_fG^o curve for MgO lies above Δ_fG^o curve for SiO₂. Hence, at a temperature above 1683 K, Si can reduce MgO to Mg.</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1687930069phpaxL1YH_480x360.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1687930069phpaxL1YH.jpeg" alt="" width="578" height="325"></picture></div></div>

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