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The correct order of the complexes [ Co ( NH ₃ )₅ ( H ₂ O ) ]³⁺ (A), [ Co ( NH ₃ )₆ ]³⁺ (B), [ Co ( CN )₆ ]³⁻( C ) and [ CoCl ( NH ₃ )₅ ]²⁺( D ) in terms wavelength of light absorbed is :

Options

  1. AD>A>B>C
  2. BC>B>D>A
  3. CD>C>B>A
  4. DC>B>A>D

Correct answer

A. D>A>B>C

Step-by-step solution

We know E = h v= hC E 1 Here all Co in +3 oxidation state. So, as the ligand field strength , CFSE Order of field strength of ligand : CN NH ₃ H ₂ O Cl ⁻ CFSE order : C B A D Wavelength order: D A B C

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