Which complex has a magnetic moment closest to that of a free d5 ion?
[Mn(H₂O)6]2+ (Mn₂+, d5) with weak field H₂O is high spin (t2g3 eg2), 5 unpaired electrons, matching a free d5 ion’s magnetic moment.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Colour and Magnetic Properties and Stability and Importance