KCET · Chemistry · Coordination Compounds
The complex ion having minimum magnitude of \( \Delta_{0}(C F S E) \) is
- A \( \left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-} \)
- B \( \left[\operatorname{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \)
- C \( \left[\mathrm{Co}(\mathrm{Cl})_{6}\right]^{3-} \)
- D \( \left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \)
Answer & Solution
Correct Answer
(C) \( \left[\mathrm{Co}(\mathrm{Cl})_{6}\right]^{3-} \)
Step-by-step Solution
Detailed explanation
The magnitude of \( \Delta_{0} \) depends upon the type of ligands. For examples; strong field ligands have high magnitude of the
\( \Delta_{0} \) and weak field ligands low magnitude of \( \Delta_{o} \). Spectro chemical order of the ligands \( \mathrm{Cl}^{-} < \mathrm{H}_{2} \mathrm{O} < \mathrm{NH}_{3} < \mathrm{CN}^{-} \)
\( \mathrm{Cl}^{-} \)is a weak field ligand, therefore, \( \Delta_{o} \) will be minimum
\( \Delta_{0} \) and weak field ligands low magnitude of \( \Delta_{o} \). Spectro chemical order of the ligands \( \mathrm{Cl}^{-} < \mathrm{H}_{2} \mathrm{O} < \mathrm{NH}_{3} < \mathrm{CN}^{-} \)
\( \mathrm{Cl}^{-} \)is a weak field ligand, therefore, \( \Delta_{o} \) will be minimum
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