NTA Abhyas JEE Main2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice
Method used for extraction of P b and S n from their chief ore
Options
- ACarbon reduction and self reduction.
- BSelf reduction and carbon reduction.
- CElectrolysis and self reduction.
- DSelf reduction and electrolysis.
Correct answer
B. Self reduction and carbon reduction.
Step-by-step solution
P b O & P b S O 4 get reduced by PbS itself which is already present in mixture so because the reduction took place by mixture itself, hence is known as self reduction. 2 P b O + P b S → Δ 3 P b + S O 2 ↑ P b S O 4 + P b S → Δ 2 P b + 2 S O 2 ↑ While Sn is obtained by carbon reduction from S n O 2 . S n O 2 + 2 C → Δ S n + 2 C O