Cl₂O₇ (l) + 3 H₂O₂ (aq) → 2 ClO₂ (g) + 3 O₂ (g) + 3 H₂O (l)

This is an oxidation-reduction (redox) reaction:

Cl₂O₇ is an oxidizing agent, H₂O₂ is a reducing agent.

Reactants:

• Cl₂O₇ – Dichlorine heptoxide
  • Other names: Chlorine(VII) oxide; Perchloric anhydride; (Perchloryloxy)chlorane trioxide
  • Appearance: Colorless liquid
• H₂O₂ – Hydrogen peroxide
  • Other names: Dioxidane , Oxidanyl , Perhydroxic acid ... show more0-hydroxyol , Dihydrogen dioxide , Oxygenated water , Peroxaan , Hydrogen peroxide (>60% solution in water) , H2O2 , Peroxide , Hydroperoxide , Hydrogen dioxide , High-strength hydrogen peroxide , Hydrogen peroxide (aqueous) show less
  • Appearance: Very light blue color; colorless in solution ; Colourless liquid ; Colorless liquid with a slightly sharp odor. [Note: The pure compound is a crystalline solid below 12°F. Often used in an aqueous solution.]

Products:

• ClO₂ – Chlorine dioxide , 4-chlorane (substitutive) OR Dioxidochlorine(•) (additive) -->
  • Other names: Chlorine(IV) oxide , Chlorine oxide , Chlorine peroxide ... show moreO2Cl(.) , [ClO2](.) , (OClO)(.) , Chlorine(IV)oxide show less
  • Appearance: Yellow to reddish gas ; Red-yellow gas with pungent odour ; Yellow to red gas or a red-brown liquid (below 52°F) with an unpleasant odor similar to chlorine and nitric acid.
• O₂
  • Names: Dioxygen , Oxygen , Oxygen (liquefied) ... show moreO2 , O₂ , Oxygen gas , Molecular oxygen , Oxygen, refrigerated liquid , LOX , Liquid oxygen show less
  • Appearance: Odourless compressed gas ; Liquefied gas. colourless-to-blue extremely cold liquid
• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide ... show moreDihydrogen monoxide (DHMO) (systematic name) , Hydrogen monoxide , Dihydrogen oxide , Hydric acid , Hydrohydroxic acid , Hydroxic acid , Hydrol , Μ-oxido dihydrogen , Κ1-hydroxyl hydrogen(0) show less
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas