H2SeO3 + 2 Zn + 4 HCl → 2 ZnCl2 + Se + 3 H2O
This is an oxidation-reduction (redox) reaction:
SeIV + 4 e- → Se0 (reduction)
2 Zn0 - 4 e- → 2 ZnII (oxidation)
H2SeO3 is an oxidizing agent, Zn is a reducing agent.
Reactants:
- H2SeO3 – Selenous acid , Selenic(IV) acid
- Zn
- HCl – Chlorane , Hydrogen chloride
- Other names: Hydrochloric acid , M , Uriatic acid
- Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
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