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In 2PbO + PbS → 3Pb + SO₂, Pb (+2 in PbO) is reduced to 0, and S (-2 in PbS) is oxidized to +4.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Balancing Redox Reactions - Oxidation Number Method and Half Reaction
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