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| 1. |
What are coloured compounds and coloured ions compound???? |
| Answer» The vast majority of simple inorganic (e.g. sodium chloride) and organic compounds (e.g. ethanol) are colorless. Transition metal compounds\xa0are often colored because of transitions of electrons between d-orbitals\xa0of different energy. Organic compounds tend to be colored when there is extensive conjugation causing the energy gap between the HOMO and LUMO to\xa0decrease, bringing the absorption band from the UV to the visible region. Similarly, color is due to the energy absorbed by the compound, when an electron transitions from the HOMO to the LUMO | |