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In FeS₂ (pyrite), Fe = +2, and S₂ acts as a peroxide-like unit with S = -1 (average). Sulfur’s state is fractional in context.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Redox Titrations and Equivalent Weight and Normality
In Fe₃O₄ (mixed oxide of FeO and Fe₂O₃), Fe has states +2 and +3, averaging to +8/3.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Balancing Redox Reactions - Oxidation Number Method and Half Reaction
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