MetallurgyHard
Question
Among the following groups of oxides, the group that cannot be reduced by carbon to give the respective metals.
Options
A.Cu2O, SnO2
B.Fe2O3, ZnO
C.CuO, K2O
D.PbO, FeO.
Solution
(A) Cu2O + C 
2Cu + CO ; SnO2 + 2C (anthracite) 
Sn + 2CO.
(B) 2Fe2O3 + 3C → 4Fe (spongy iron) + 3CO2 ; ZnO + C
Zn + CO.
(C) Oxides of highly reactive metals (like K2O) are not reduced by carbon. K lie above hydrogen in electrochemical series and so it acts as strong reducing agent. K is obtained by electrolytic reduction of their fused salts.
(D) FeO + C → Fe + CO ; PbO + C → Pb + CO
2Cu + CO ; SnO2 + 2C (anthracite) Sn + 2CO.(B) 2Fe2O3 + 3C → 4Fe (spongy iron) + 3CO2 ; ZnO + C
Zn + CO.(C) Oxides of highly reactive metals (like K2O) are not reduced by carbon. K lie above hydrogen in electrochemical series and so it acts as strong reducing agent. K is obtained by electrolytic reduction of their fused salts.
(D) FeO + C → Fe + CO ; PbO + C → Pb + CO
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