Chemistry - Coordination Chemistry Question with Solution | TestHub

The complex is octahedral and shows geometrical isomerism, giving two isomers, so (A) is correct. Replacement of en by two CN⁻ gives an MA₃B₂ system which shows three geometrical isomers, so (B) is correct. Co³⁺ with strong field ligands is low spin and diamagnetic, so (C) is wrong. Presence of weaker field H₂O decreases Δ₀, shifting absorption to longer wavelength, hence (D) is correct.