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The main ore of lead is galena (PbS). Lend is extracted from galena ore either by (P) or (Q).
(P) $PbS \underset{in air}{\overset{Roasted}{⟶}} PbO + {SO}_{2} ↓ Heated with C ↓ \to Pb + {CO}_{2}$
(Q) $PbS \underset{in air}{\overset{Roasted}{⟶}} PbO + {SO}_{2} ↓ Heated with PbS ↓ \to Pb + {SO}_{2}$
Auto-reduction process is :

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only Q

only P

none of these

both P and Q

answer is B.

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Detailed Solution

The technique of self-reduction used to remove lead (Pb) from galena (PbS) is,

$2 PbS + 3 O_{2} ⟶ 2 PbO + 2 {SO}_{2}$

PbS is further reduced using the lead oxide is formed

$PbS + 2 PbO ⟶ 3 Pb + {SO}_{2}$ (self-reduction)
Therefore, option B is correct.

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