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JEE Main2013ChemistryCoordination CompoundsActual

In which of the following octahedral complex species the magnitude of ₀ will be maximum?

Options

  1. A[ Co ( H ₂ O )₆ ]²⁺
  2. B[ Co ( CN )₆ ]³⁻
  3. C[ Co ( C ₂ O ₄ )₃ ]³⁻
  4. D[ Co ( NH ₃ )₆ ]³⁺

Correct answer

B. [ Co ( CN )₆ ]³⁻

Step-by-step solution

Crystal field splitting depends upon the nature of ligand. The nature of ligand decreases as shown below C ₂ O ₄⁻⁻ < H ₂ O < NH ₃ < CN ⁻ hence the crystal field splitting will be maximum for [ Co ( CN )₆ ]³⁻

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