Question

Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

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• A. $Cu$
• B. $Zn$
• C. $Mg$
• D. $Fe$

Answer 1

The correct option is C $Mg$

The metal which is more reactive than ${}^{\prime }A{l}^{\prime }$ can reduce alumina i.e. ${}^{\prime }M{g}^{\prime }$ should be the correct option. This is because the gibbs energy change for the redox reaction with Mg will have a -ve value, meaning a spontaneous process.