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NTA Abhyas JEE Main2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice

Pb and S n are extracted from their chief ore respectively by

Options

  1. ACarbon reduction and self reduction
  2. BSelf reduction and carbon reduction
  3. CElectrolysis and self reduction.
  4. DSelf reduction and electrolysis.

Correct answer

B. Self reduction and carbon reduction

Step-by-step solution

PbO and PbSO 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. 2PbO+PbS → Δ 3Pb+SO 2 ↑ P b S O 4 + P b S → Δ 2 P b + 2 S O 2 ↑ SnO 2 +   C → Sn   + CO 2

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