H₂ Hydrogen gas - H⁺ Hydrogen ions, Zn/Mg/Fe Zinc/magnesium/iron metal - Zn²⁺/Mg2+/Fe2+ Zinc/magnesium/iron ionsons, Fe²⁺ Iron (II) ions - Fe³⁺ Iron (III) ions, Cl⁻ Chloride ions - Cl₂ Chlorine gas, I⁻ Iodide ions - I₂ Iodine solution, Br⁻ Bromide ions - Br₂ Bromine solution, SO₂ Sulfur dioxide gas - SO₄²⁻ Sulfate ions, SO₃²⁻ Sulfite ions - SO₄²⁻ Sulfate ions, H₂O₂ Hydrogen peroxide - O₂ Oxygen gas, H₂S Hydrogen sulfide - S sulfur, C (low oxygen) Carbon - CO Carbon monoxide gas, C (sufficient oxygen) Carbon - CO2 Carbon dioxide gas,

redox reductant species pairs

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