Question:

The correct statement regarding the given Ellingham diagram is: at 500oC, coke can be used for the extraction of Zn from ZnO; at 800oC, Cu can be used for the extraction of Zn from ZnO; coke cannot be used for the extraction of Cu from Ca2O; at 1400oC, Al can be used for the extraction of Zn from ZnO.

at500oC,coke can be used for the extraction ofZnfromZnO

at1400oC,Alcan be used for the extraction ofZnfromZnO

at800oC,Cucan be used for the extraction ofZnfromZnO

coke cannot be ussed for the extartion ofCufromCa2O.

Ans. 4 According to the given diagram Al can reduce ZnO. 3ZnO + 2Al → 3Zn + Al2O3.