Why are complex ions are often coloured? All red light is absorbed by the ligand

Question

Why are complex ions are often coloured? All red light is absorbed by the ligands in a complex ion due to the d orbitals and the resultant light is coloured. Light is absorbed when the complex is first formed and emitted the when d orbitals are released producing a coloured light. Ligands cause splitting of d-orbitals and in the presence of visible light, electrons become excited to higher energy d-orbitals Light is absorbed in the process and the resultant light is coloured. Visible light causes the metal ions d orbital electrons to become excited to higher energy levels Energy is emitted in the process and the resultant light is red.

Explanation / Answer

Ligands can cause splitting of d-orbitals of the central metal ion and in the presence of visible light, electrons become excited to higher energy d-orbitals.Light is absorbed in the process and the resultant light is coloured.

Therefore third option is correct.

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