Observe the following complexes aligned & [ Mn ( CN )₆ ]³⁻, [ Fe ( CN )₆ ]⁻³, [ Co ( C ₂ O ₄ )₃ ]³⁻, [ MnCl ₆ ]³⁻, & [ Fe ( CN )₆ ]⁴⁻, [ CoF ₆ ]³⁻ aligned From the above, the number of inner orbital complexes with paramagnetic nature is

Step-by-step solution

aligned & [ Mn ( CN )₆ ]³⁻:- & Mn ³⁺=[ Ar ]^3 ~d ^4 aligned CN ⁻ is a strong-field ligand so it pairs the electrons. Thus, [ Mn ( CN )₆ ]³⁻= Thus, it is an inner-orbital but a diamagnetic complex. aligned & [ Fe ( CN )₆ ]³⁻:- & Fe ³⁺=[ Ar ] 3 ~d ^5 aligned CN ⁻ will pair - up the electrons so :- [ Fe ( CN )₆ ]³⁻= Thus, it is an inner-orbital and a paramagnetic complex. aligned & [ Co ( C ₂ O ₄ )₃ ]³⁻:- & Co ³⁺=[ Ar ] 3 ~d ^6 aligned C ₂ O ₄ ²⁻ is a weak-field ligand so :- [ Co ( C ₂ O ₄ )₃ ]³⁻= Thus, it is an outer