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  • Which among the following metals can be used to reduce alumina? Ellingham diagram: <img alt="" src="https://cdn.entrance360.com/media/uploads/2023/08/09/que-image.jpg" style="height:262px

Which among the following metals can be used to reduce alumina? Ellingham diagram:

Option: 1

Fe


Option: 2

Cu


Option: 3

Zn


Option: 4

Mg


Answers (1)

best_answer

Considering Ellingham diagram. 

Mg metal can be used to reduce alumina. 

More negative the value of ΔG, the greater is the tendency, of the element to combine with Oxygen. The negative free energy change for the formation of  MgO from Mg is greater than that for the formation of \mathrm{Al_{2}O_{3}} from Al.

Hence, Mg has greater tendency to undergo oxidation than Al. Hence, Mg is oxidised and \mathrm{Al_{2}O_{3}} is reduced to Al.

Posted by

seema garhwal

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