S4 + 4 O2 → 4 SO2
This is an oxidation-reduction (redox) reaction:
4 S0 - 16 e- → 4 SIV (oxidation)
8 O0 + 16 e- → 8 O-II (reduction)
S4 is a reducing agent, O2 is an oxidizing agent.
Reactants:
- S4
- O2
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.]