Question

Write the order of relative tendency of following metal to undergo oxidation on the
basis of Ellingham diagram Mg, Al, Hg, Ag

Answer 1

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Considering Ellingham diagram, which of the following metals can be used to reduced alumina?

A

Mg

B

Fe

C

Cu

D

Zn

Medium

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Solution

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Correct option is

A

Mg

Considering Ellingham diagram, Mg metal can be used to reduced alumina.

The negative free energy change for the formation of MgO from Mg is greater than that for the formation of Al

2 O 3from Al. Hence, Mg has greater tendency to undergo oxidation than Al. Hence, Mg is oxidised and Al

2O 3is reduced to Al.

Note: More negative the value of ΔG, the greater is the tendency, of the element to combine with oxygen.

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