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Which of the following is diamagnetic ?

Options

  1. A[ Fe ( CN )₆ ]³⁻
  2. B[ Co ( ox )₃ ]³⁻
  3. C[ FeF ₆ ]³⁻
  4. D[ CoF ₆ ]³⁻

Correct answer

B. [ Co ( ox )₃ ]³⁻

Step-by-step solution

[ Fe ( CN )₆ ]³⁻ has magnetic moment of a single unpaired electron whereas [ FeF ₆ ]³⁻ has a magnetic moment of five unpaired electrons. [ CoF ₆ ]³⁻ is paramagnetic with four unpaired electrons while [ Co ( C ₂ O ₄ )₃ ]^3 is diamagnetic. This anomaly is explained by valence bond theory in terms of formation of inner and outer orbital coordination entities. [ Co ( C ₂ O ₄ )₃ ]³⁻ is an inner orbital complexes having d^2 s p^3 hybridization.

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