Which complex has a d6 metal ion that is low spin in an octahedral field?
[Co(CN)6]3− (Co₃+, d6) with strong field CN− is low spin (t2g6).
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Optical Isomerism and Linkage Ionisation Solvate