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In PbO₂ + C → Pb + CO₂, Pb (+4 in PbO₂) loses oxygen to become 0, reduced by C (0 to +4), no hydrogen present.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Balancing Redox Reactions - Oxidation Number Method and Half Reaction
In NiO + H₂ → Ni + H₂O, NiO (Ni: +2 to 0) is reduced, oxidizing H₂ (0 to +1).
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Applications of Redox Reactions and Disproportionation
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