1. Oxidised state MnO 4 - Purple (aq) Permanganate Oxidised state Cr 2 O 7 2- Orange (aq) Dichromate Reduced state Cr 3+ Green (aq) Chromium ion Oxidised state MnO 4 - Purple (aq) Permanganate

2. Oxidised state Fe 3+ Orange (aq) Iron (lll) ion Oxidised state Cu 2+ Blue (aq) Copper (ll) ion Reduced state Fe 2+ Green (aq) Iron (ll) ion Reduced state NO 2 Brown (g) Nitrogen dioxide

3. Oxidised state I 2 Blue-Black (s) Iodine Oxidised state MnO 4 - Purple (aq) Permanganate Reduced state (Alkaline conditions) MnO 4 2- Green (aq) Manganate Reduced state (Neutral conditions) MnO 2 Brown (s) Manganese dioxide

4. Oxidised state Cl 2 Pale green (g) Chlorine Oxidised state S yellow (s) Sulfur Oxidised state Br 2 Brown (s) Bromine Reduced state Cu Red/brown (s) Copper

5. Oxidised state ClO 3 - colourless (aq) Chlorate Oxidised state O 2 colourless (g) Oxygen Reduced state Cl - Colourless (aq) Chloride ion Reduced state O 2- colourless (aq) Oxide ion

6. Oxidised state H + colourless (aq) Hydrogen ion Reduced state H 2 Colourless (g) Hydrogen gas Reduced state Br - colourless (aq) Bromide Reduced state H 2 S colourless (g) Hydrogen sulfide

7. Oxidised state CO colourless (g) Carbon monoxide Oxidised state O 2 colourless (g) oxygen Reduced state C Black (s) Carbon Reduced state H 2 O 2 colourless (l) Hydrogen peroxide

8. Reduced state C Black (s) Carbon

9. Oxidised state SO 4 2- colourless (aq) Sulfate ion Oxidised state H 2 O 2 colourless (l) Hydrogen peroxide Reduced state SO 2 colourless (g) Sulfur dioxide Reduced state H 2 O colourless (l) Water

10. Oxidised state CO 2 colourless (g) Carbon dioxide Oxidised state O 2 colourless (g) oxygen Reduced state H 2 C 2 O 4 colourless (l) Oxalic acid Reduced state H 2 O 2 colourless (l) Hydrogen peroxide

11. Reduced state Mn 2+ Colourless (aq) Manganese ion Reduced state Cu + White (aq) Copper (l) ion Reduced state I - colourless (aq) Iodide Oxidised state NO 3 - colourless (aq) Nitrate ion

12. Oxidised state BrO 3 - colourless (aq) Bromate Reduced state Zn 2+ colourless (aq) Zinc ion Reduced state Cu + White (aq) Copper (l) ion Reduced state Zn silver (s) Zinc

13. Oxidised state Zn 2+ colourless (aq) Zinc ion Reduced state Br - colourless (aq) Bromide Oxidised state Cu + White (aq) Copper (l) ion Reduced state Cl - Colourless (aq) Chloride ion