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Predict conditions under which Al might be expected to reduce MgO.

6.27 Predict conditions under which Al might be expected to reduce MgO.

As per the Ellingham diagram, above 1350, the standard Gibbs free energy of formation $(\Delta G^{0}_{f})$ of $Al_{2}O_{3}$ is lower than the $MgO$ from $Mg$. So, that's why above $1350^{0}C$ , $Al$ can reduce MgO.