First slide

General methods of extraction of elements from the earth crust

Question

Which of the oxide groups among the following cannot be reduced by carbon?

Easy

A

Fe₂O₃, ZnO
B

Cu₂O, SnO₂
C

CaO, K₂O
D

PbO, Fe₂O₃

Solution

Highly reactive metals like K and Ca cannot be reduced by carbon. The oxides of less electropositive metals like Fe, Zn, Pb, Sn, Cu etc. are reduced by strongly heating them with coal or coke, in the blast furnace.

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