Chemistry - Coordination Chemistry Question with Solution | TestHub

A. [Cr(NH₃)₄Cl₂]Cl: Cr³⁺ ($d^3$) is paramagnetic. Square planar or octahedral complexes with two identical ligands can exhibit cis-trans isomerism. This is an octahedral complex. Correct.

B. [Ti(H₂O)₅Cl]NO₃: Ti³⁺ ($d^1$) is paramagnetic. Ionisation isomerism involves exchange of an ion inside and outside the coordination sphere. Correct.

C. [Pt(en)(NH₃)Cl]NO₃: Pt²⁺ ($d^8$) in square planar complexes is diamagnetic. Ionisation isomerism is possible. Correct.

D. [Co(NH₃)₄(NO₃)₂]NO₃: Co³⁺ ($d^6$) is diamagnetic (low spin). Exhibits cis-trans isomerism. Incorrect.