Extraction of Metals - Result Question 16

####16. The correct statement regarding the given Ellingham diagram is

(2019 Main, 9 Jan II)

(a) At 800C,Cu can be used for the extraction of Zn from ZnO

(b) At 1400C,Al can be used for the extraction of Zn from ZnO

(c) At 500C, coke can be used for the extraction of Zn from ZnO

(d) Coke cannot be used for the extraction of Cu from Cu2O

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Solution:

  1. From the Ellingham diagram, we can say that any oxide with lower value of ΔG is more stable than a oxide with higher value of ΔG. We can also predict that the oxide placed higher in the diagram can be reduced by the element involved in the formation of its oxide placed lower at that temperature in the diagram.

It is happening in case of ZnO for its reduction by Al at 1400C.



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