Among the following processes, how many are employed for the extraction of lead from ore galena?

(i) Self reduction , (ii) Carbon reduction , (iii) Metal displacement method , (iv) electrolytic reduction ,(v) Carbon monoxide reduction, (vi) Hydrogen reduction

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Solution

Following three processes are employed for the extraction of lead from ore galena.
(i) Self reduction , (ii) Carbon reduction , (iii)Carbon monoxide reduction.
(i) Self reduction
$P b S + 1 / 2 O_{2} ⟶ P b O + S O_{2} ↑$
$P b S + 2 P b O ⟶ 3 P b (l) + S O_{2} ↑$
(ii) Carbon reduction
$P b O + C ⟶ P b (l) + C O_{2} ↑$
(iii)Carbon monoxide reduction.
$P b O + C O ⟶ P b (l) + C O_{2} ↑$

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(A) Iron or Zinc	(i) Reduction with aluminium
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