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
Create a free account to view solution
View Solution FreeMore Metallurgy Questions
Match Column-I with Column-II and select the correct answer using the codes given below :Column-I (Metals) Column-II (Or...Choose the correct option using the code regarding roasting process.(I) It is the process of heating the ore in air in a...In electrolysis of Al2O3 by Hall-Heroult process :...Ellingham diagram represents :...The major role of fluorspar (CaF2) which is added in small quantities in the electrolytic reduction of alumina dissolved...