4 KMnO4 (aq) + 7 CH2O (aq) → 7 H2O (l) + 5 CO2 (g) + 2 K2CO3 (aq) + 4 Mn (s)

This is an oxidation-reduction (redox) reaction:

4 MnVII + 28 e- → 4 Mn0 (reduction)

7 C0 - 28 e- → 7 CIV (oxidation)

KMnO4 is an oxidizing agent, CH2O is a reducing agent.

This is a precipitation reaction: Mn is the formed precipitate.

This is a gas evolution reaction, CO2 is the formed gas.

Reactants:

  • KMnO4 – Potassium manganate(VII) source: wikipedia, accessed: 2019-09-27
    • Other names: Potassium permanganate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Chameleon mineral source: wikipedia, accessed: 2019-09-27, Condy's crystals source: wikipedia, accessed: 2019-09-27
    • Appearance: Purplish-bronze-gray needles | magenta–rose in solution source: wikipedia, accessed: 2019-09-27; Dark purple crystals source: ICSC, accessed: 2019-09-04
  • CH2O – Formaldehyde source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Methanal source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Methyl aldehyde source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Methylene glycol source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Methylene oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: Colorless gas source: wikipedia, accessed: 2019-09-27; Colourless gas with pungent odour source: ICSC, accessed: 2019-09-04; Colourless liquid with pungent odour source: ICSC, accessed: 2019-09-04; Nearly colorless gas with a pungent, suffocating odor. [Note: Often used in an aqueous solution (see specific listing for Formalin).] source: NIOSH NPG, accessed: 2019-09-02

Products:

  • H2O – Water, oxidane source: wikipedia, accessed: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27
  • CO2
    • Names: Carbon dioxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, {{plainlist| source: wikipedia, accessed: 2019-09-27, CO2 source: wikidata, accessed: 2019-09-02
    • Appearance: Colorless gas source: wikipedia, accessed: 2019-09-27; Odourless colourless compressed liquefied gas source: ICSC, accessed: 2019-09-04; Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Solid form is utilized as dry ice.] source: NIOSH NPG, accessed: 2019-09-02
  • K2CO3 – Potassium carbonate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Carbonate of potash source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Dipotassium carbonate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Sub-carbonate of potash source: wikipedia, accessed: 2019-09-27
    • Appearance: White, hygroscopic solid source: wikipedia, accessed: 2019-09-27; Colourless hygroscopic crystals or hygroscopic white powder source: ICSC, accessed: 2019-09-04
  • Mn
    • Names: Manganese source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04, Mn source: wikidata, accessed: 2019-09-07, Element 25 source: wikidata, accessed: 2019-09-07
    • Appearance: Grey-white powder source: ICSC, accessed: 2019-09-04