Predict conditions under which $A l$ might be expected to reduce $M g O$ .

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Solution

Below $1350^{\circ} C, M g$ can reduce $A l_{2} O_{3}$ and above $1350^{\circ} C$ , $A l$ can reduce $M g O$ . This can be inferred from $Δ G^{⊖} V s T$ plots.
$Δ G^{⊖} V s T$ plot for $M g$ , $M g O$ is below $Δ G^{⊖} V s T$ plot for Al. At the point of intersection ( corresponding to $1350^{\circ} C$ ), $Δ G^{⊖}$ for combined reaction is zero. After $1350^{\circ} C$ , Mg, MgO curve is higher than Al $A l_{2} O_{3}$ curve. There are practical difficulties to attain higher temperature.

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