The correct statement regarding the given Ellingham diagram is:

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Question:
The correct statement regarding the given Ellingham diagram is:

At $800^{\circ} \mathrm{C}$, Cu can be used for the extraction of $\mathrm{Zn}$ from $\mathrm{ZnO}$
At $500 \mathrm{C}$, coke can be used for the extraction of $\mathrm{Zn}$ from $\mathrm{ZnO}$
Coke cannot be used for the extraction of $\mathrm{Cu}$ from $\mathrm{Ca}_{2} \mathrm{O}$.
At $1400^{\circ} \mathrm{C}, \mathrm{Al}$ can be used for the extraction of $\mathrm{Zn}$ from $\mathrm{ZnO}$

Correct Option: , 4

Solution:

According to the given diagram $\mathrm{Al}$ can reduce $\mathrm{ZnO}$.

$3 \mathrm{ZnO}+2 \mathrm{Al} \rightarrow 3 \mathrm{Zn}+\mathrm{Al}_{2} \mathrm{O}_{3}$