Which reaction demonstrates reduction by the removal of oxygen from a metal oxide without hydrogen involvement?
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