MetallurgyHard
Question
Which of the following statement(s) is (are) true ?
Options
A.In the process of precipitation of silver from sodium dicyanidoargentate (I), the zinc acts as reducing agent as well as complexing agent.
B.In process of the roasting, the copper pyrite is converted into a mixture of Cu2S & FeS which, in turn, are partially oxidised
C.Limonite, haematite and magnesite are ores of iron.
D.Tin and lead both are extracted from their ores by self-reduction
Solution
(A) Ag + 2CN- + O2 + 2H2O → [Ag(CN)2]- + 4OH-
[AgI (CN)2]- + Zn0 → Ag0 + [ZnII(CN)4]2-
(B) 2CuFeS2 + O2 → Cu2S + 2FeS + SO2
2Cu2S + 3O2 → 2Cu2O + 2SO2 ; 2FeS + 3O2 → 2FeO + 2SO2
(C) Magnesite, MgCO3 is the ore of magnesium.
(D) Tin is extracted by carbon reduction. SnO2 + 2C → Sn + 2CO
Lead is extracted by carbon and self reduction.
[AgI (CN)2]- + Zn0 → Ag0 + [ZnII(CN)4]2-
(B) 2CuFeS2 + O2 → Cu2S + 2FeS + SO2
2Cu2S + 3O2 → 2Cu2O + 2SO2 ; 2FeS + 3O2 → 2FeO + 2SO2
(C) Magnesite, MgCO3 is the ore of magnesium.
(D) Tin is extracted by carbon reduction. SnO2 + 2C → Sn + 2CO
Lead is extracted by carbon and self reduction.
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