5C 1b Colours of transition metal compounds, ions or complexes

Select the colour of the species on the left by using the drop-down list.
Cu2O(s)
CuO(s)
MnO4-(aq)
MnO42-(aq)
MnO2(s)
Mn2+(aq)
Cr2O3(aq)
CrO42-(aq)
Cr2O72-(aq)
Fe2+(aq)
Fe3+(aq)
Cu2+(aq)
[Cu(NH3)4]2+
[FeSCN]2+
ZnO(s) cold
ZnO(s) hot
[Zn(OH)4]2-
V2+
V3+
VO2+
VO2+