MetallurgyHard
Question
Select the correct statement :
Options
A.Dolomite contains both magnesium and calcium.
B.Extraction of lead from galena involves roasting in limited supply of air at moderate temperature followed by self reduction at higher temperature (to melt the charge).
C.Extraction of zinc from zinc blende involves roasting followed by reduction with carbon.
D.The chemical composition of ′slag′ formed during the extraction of iron and copper is FeSiO3.
Solution
(A) dolomite is CaCO3.MgCO3
(B) 2PbS + 3O2
2PbO + 2SO2
PbS + 2PbO
3Pb + SO2
(C) 2ZnS + 3O2
2ZnO + 2SO2
ZnO + C
Zn + CO
(D) In extraction of iron the slag obtained is CaSiO3 where as in copper it is FeSiO3.
(B) 2PbS + 3O2
2PbO + 2SO2 PbS + 2PbO
3Pb + SO2(C) 2ZnS + 3O2
2ZnO + 2SO2 ZnO + C
Zn + CO(D) In extraction of iron the slag obtained is CaSiO3 where as in copper it is FeSiO3.
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