Why are some complex ions coloured?
Ligands causes d orbitals to split. Electrons get excited to higher energy levels from ground state. Visible light is absorbed to promote electron to a higher energy level and the light that is not absorbed is transmitted to give the colour of the ion.
JO
Related Chemistry A Level answers
All answers ▸Explain why silicon dioxide has a higher melting point than sulphur trioxide
Calculate pH of 0.1M NaOH
Why do ionic compounds like NaCl conduct electricity when dissolved but not when they’re solid, whereas metals conduct electricity when they’re solid?
Explain why alkenes can have stereoisomers