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