6 NH4ClO4 + 8 P → 8 H3PO3 + 3 Cl2 + 3 N2

This is an oxidation-reduction (redox) reaction:

8 P0 - 24 e- → 8 PIII (oxidation)

6 Cl-I - 6 e- → 6 Cl0 (oxidation)

6 NV + 30 e- → 6 N0 (reduction)

P is a reducing agent, NH4ClO4 is a reducing agent, NH4ClO4 is an oxidizing agent.

Reactants:

  • NH4ClO4 – Ammonium perchlorate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04
    • Other names: AP source: wikipedia, accessed: 2019-09-27, Perchloric acid, ammonium salt source: ICSC, accessed: 2019-09-04
    • Appearance: White Crystalline source: wikipedia, accessed: 2019-09-27; White hygroscopic crystals source: ICSC, accessed: 2019-09-04
  • P

    Products:

    • H3PO3 – Phosphonic acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-04
      • Other names: Phosphorous acid source: wikipedia, accessed: 2019-09-27, Dihydroxyphosphine oxide source: wikipedia, accessed: 2019-09-27
      • Appearance: White solid | deliquescent source: wikipedia, accessed: 2019-09-27
    • Cl2
      • Names: Chlorine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Molecular chlorine source: NIOSH NPG, accessed: 2019-09-02
      • Appearance: Greenish-yellow compressed liquefied gas with pungent odour source: ICSC, accessed: 2019-09-04; Greenish-yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.] source: NIOSH NPG, accessed: 2019-09-02
    • N2
      • Names: Dinitrogen source: wikidata, accessed: 2019-09-07, Nitrogen (compressed gas) source: ICSC, accessed: 2019-09-04, Nitrogen (liquified) source: ICSC, accessed: 2019-09-04
      • Appearance: Odourless colourless compressed gas source: ICSC, accessed: 2019-09-04; Odourless colourless extremely cold liquid source: ICSC, accessed: 2019-09-04