The given statement is true.
Explanation:
The metals containing more than one ions in the periodic table are regarded as transition metals. The complex ion containing metals possess colours unlike metals of non-transition. The orbitals that are field partially are responsible for colors in these metals.
The ligand arrangements in the ion of this metal make the d orbitals to split in energy. The passing of light through the ion solution make the light to transit from lower to upper case of orbitals. Whenever the yellow light is absorbed in the metal hexaaquacopper, it changes its colour to dark blue.
