Question

Which of the following reduction reaction cannot be carried out with coke ?

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Answer 1

Any metal will reduce the oxide of other metal which lie above it in Ellingham diagram. $Fe,Zn,Cu$ reduction can be carried out with coke since they lie above.
Also,from the Ellingham diagram, the difference in the $\Delta G^{\circ }$ values is very much positive, that's why reduction of $A{l}_2{O}_3$ with coke is non-spontaneous.
Option (c) is correct