MetallurgyHard

Question

Which one of the following metals cannot be extracted by carbon reduction ?

Options

A.Pb
B.Fe
C.Zn
D.Al

Solution

Electrolytic reduction method is used in the extraction of highly electropositive elements as they themselves are stronger reducing agents. They lie above hydrogen in electrochemical series. The heat of formation of Al2O3 is very high and therefore, at higher temperature there will be the possibility of formation of Al4C3 with carbon.

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