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Why `AI` can reduce oxide of `Cr` but not reduce oxide of `Mg` and `Ca` at `800^(@)C`?

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Why `AI` can reduce oxide of `Cr` but not reduce oxide of `Mg` and `Ca` at `800^(@)C`?
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A metal can reduce the oxide of metal placed above in the diagram. Due to more negative free energy. Such that, `AI` can reduce `Cr` but not `Mg` or `Ca`.
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