S + O2 → SO2 – Balanced equation

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This is an oxidation-reduction (redox) reaction:

S - 4 e^- → S^IV (oxidation)

2 O + 4 e^- → 2 O^-II (reduction)

S is a reducing agent, O₂ is an oxidizing agent.

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Reactants:

S
- Names: Sulfur , S , Sulphur
- Appearance: Yellow solid in various forms
O₂
- Names: Dioxygen , Oxygen , Oxygen (liquefied)
- Appearance: Odourless compressed gas ; Liquefied gas. colourless-to-blue extremely cold liquid

Products:

SO₂ – Sulfur dioxide
- Other names: Sulfurous anhydride , Sulphur dioxide , Sulfurous acid anhydride
- Appearance: Colorless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.]

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