Question

Using Ellingham diagram, predict which metal can readily reduce the $C{u}_{2}O$ to $Cu$ at ${400}^{o}C$.

Ellingham diagram:

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

Answer 1

The correct option is C $Mg$

Any metal will reduce the oxide of other metal which lie above it in Ellingham diagram.

The difference in two ${\Delta }_{r}G$ values determines whether reduction of oxide of upper line is feasible. Hence, If the difference between upper and lower line is large, the reduction is easier.
Hence, $Mg$ will reduce $C{u}_{2}O$ readily at ${400}^{o}C$.