A) spectrochemistry
B) chelate effect
C) crystal field theory
D) None of the above
Correct Answer: C
Solution :
The coloured nature of solutions of coordination compounds is explained on the basis of crystal field theory. According to this theory, in such compounds, the energy difference between two sets of \[d-\]orbitals is usually small. So, excitation of an electron from lower energy to higher energy is very easy and can be achieved even by the absorption of low energy radiations of visible region. As a result of the absorption of such selected wavelengths of visible light, the complexes appeared coloured.
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