Which complex has a d4 metal ion with 2 unpaired electrons in an octahedral field?
[Mn(CN)6]3− (Mn₃+, d4) with strong field CN− is low spin (t2g4), 2 unpaired electrons.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds