SO2 + H2 → H2S + O2 – Balanced equation

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This is an oxidation-reduction (redox) reaction:

S^IV + 6 e^- → S^-II (reduction)

2 H - 2 e^- → 2 H^I (oxidation)

2 O^-II - 4 e^- → 2 O (oxidation)

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SO₂ is an oxidizing agent, H₂ is a reducing agent, SO₂ is a reducing agent.

Reactants:

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.]
H₂
- Names: Dihydrogen , Hydrogen , H2
- Appearance: Odourless colourless compressed gas

Products:

H₂S – Hydrogen sulfide
- Other names: D , Ihydrogen monosulfide|Dihydrogen sulfide|Sewer gas|Sulfane|Sulfurated hydrogen|Sulfureted hydrogen|Sulfuretted hydrogen|Sulfur hydride|Hydrosulfuric acid|Hydrothionic acid|Thiohydroxic acid|Sulfhydric acid}} , Hydrosulfuric acid
- Appearance: Colorless gas ; Colourless compressed liquefied gas with characteristic odour of rotten eggs ; Colorless gas with a strong odor of rotten eggs. [Note: Sense of smell becomes rapidly fatigued & can NOT be relied upon to warn of the continuous presence of H2S. Shipped as a liquefied compressed gas.]
O₂
- Names: Dioxygen , Oxygen , Oxygen (liquefied)
- Appearance: Odourless compressed gas ; Liquefied gas. colourless-to-blue extremely cold liquid