2 NiS (s) + 3 O2 (g) → 2 NiO (s) + 2 SO2 (aq)

This is an oxidation-reduction (redox) reaction:

2 S-II - 12 e- → 2 SIV (oxidation)

6 O0 + 12 e- → 6 O-II (reduction)

NiS is a reducing agent, O2 is an oxidizing agent.

Reactants:

  • NiS – Nickel sulfide {{cite web | url=https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=28094&loc=ec_rcs source: wikipedia, accessed: 2019-09-27
    • Other names: Nickel sulfide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Nickel monosulfide source: wikipedia, accessed: 2019-09-27, Nickelous sulfide source: wikipedia, accessed: 2019-09-27, Nickel(II) sulfide source: wikidata, accessed: 2019-09-02
    • Appearance: Black solid source: wikipedia, accessed: 2019-09-27
  • O2
    • Names: Dioxygen source: wikidata, accessed: 2019-09-07, Oxygen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, Oxygen (liquefied) source: ICSC, accessed: 2019-09-04
    • Appearance: Odourless compressed gas source: ICSC, accessed: 2019-09-04; Liquefied gas. colourless-to-blue extremely cold liquid source: ICSC, accessed: 2019-09-04

Products:

  • NiO – Nickel(II) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Nickel monoxide source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04, Oxonickel source: wikipedia, accessed: 2019-09-27, Nickel(ii)oxide source: ICSC, accessed: 2019-09-04, Nickelous oxide source: ICSC, accessed: 2019-09-04
    • Appearance: Green crystalline solid source: wikipedia, accessed: 2019-09-27; Green-to-black crystalline powder source: ICSC, accessed: 2019-09-04
  • SO2 – Sulfur dioxide source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Sulfurous anhydride source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Sulphur dioxide source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-02, Sulfurous acid anhydride source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: Colorless gas source: wikipedia, accessed: 2019-09-28; Colourless gas or compressed liquefied gas with pungent odour source: ICSC, accessed: 2019-09-04; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.] source: NIOSH NPG, accessed: 2019-09-02