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| 1. |
Explain giving reasons : The transition metals generally form coloured compounds. |
| Answer» Solution :In MANY COMPOUNDS of transition metals, the CENTRAL metal ion incompletely filled d - orbitals. Under the influence of surrounding groups or ions, the d - orbitals of the metal ion do not remain degenerate, but split usually into two sets of d - orbitals (within the same SUBSHELL). By absorption of radiation of a certain wavelength from the visible light, an electron from lower energy d - orbital is excited to a higher energy d - orbital. The compound appears to have colour which corresponds to the complementary colour of the radiation ABSORBED. The compounds, in which no d - d transition occurs, are colourless. | |