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Question
On the basis of Crystal Field theory, write the electronic configuration for the d5 ion with a strong field ligand for which Δ0 > P.
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Solution
If Δ0 > P, it becomes more energetically favourable for the fourth electron to occupy a t2g orbital with configuration `"t"_(2"g")^5"e"_"g"^0`. Ligands which produce this effect are known as strong field ligands and form low-spin complexes.
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RELATED QUESTIONS
Why are low spin tetrahedral complexes rarely observed?
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Read the passage carefully and answer the questions that follow.
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Crystal field splitting by various ligands Metal complexes show different colours due to d-d transitions. The complex absorbs light of specific wavelength to promote the electron from t2g to eg level. The colour of the complex is due to the transmitted light, which is complementary of the colour absorbed. The wave number of light absorbed by different complexes of Cr ion are given below:
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Answer the following questions:
(a) Out of ligands "A", "B", "C" and "D", which ligand causes maximum crystal field splitting? Why?
OR
Which of the two, “A” or “D” will be a weak field ligand? Why?
(b) Which of the complexes will be violet in colour? [CrA6]3- or [CrB6]3+ and why?
(Given: If 560 - 570 nm of light is absorbed, the colour of the complex observed is violet.)
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- [CrA6]3-
- [CrC6]3+
