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Formation of Coloured Ions is considered one of the most asked concept.
8 Questions around this concept.
When an electron from a lower energy d orbital is excited to a higher energy d orbital, the energy of excitation corresponds to the frequency of light absorbed. This frequency generally lies in the visible region. The colour observed corresponds to the complementary colour of the light absorbed. The frequency of the light absorbed is determined by the nature of the ligand. In aqueous solutions where water molecules are the ligands, the colours of the ions are observed.
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Chemistry Part I Textbook for Class XII
Page No. : 229
Line : 6
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