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NEET2018ChemistryGeneral Principles and Processes of Isolation of MetalsActual

Lead is extracted from galena ( PbS ) , either by following ways. Auto-reduction process is

Options

  1. AI
  2. BII
  3. CBoth (a) and (b)
  4. DNone of these

Correct answer

B. II

Step-by-step solution

In auto-reduction, no external reducing agent is required. In such reduction reaction, the product formed acts as a reducing agent and reduces the oxide to metal. Thus, only reaction II is called auto-reduction. aligned & 2 PbS +3 O ₂ Roasted in air 2 PbO +2 SO ₂ & 2 PbO + PbS 3 ~Pb + SO ₂ & array l (Act as a reducing agent) array aligned

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