Chemistry - Coordination Chemistry Question with Solution | TestHub
For each of the following coordination compounds, state whether the given description about its magnetic nature and type of isomerism is correct.
Options:(select one or more)
Answer:
Solution:
A. [Cr(NH₃)₄Cl₂]Cl: Cr³⁺ (d³) is paramagnetic. Square planar or octahedral complexes with two identical ligands can exhibit cis-trans isomerism. This is an octahedral complex, so it exhibits cis-trans isomerism. Correct.
B. [Ti(H₂O)₅Cl]NO₃: Ti³⁺ (d¹) is paramagnetic. Ionisation isomerism occurs when the counter ion can exchange with a ligand. Here, Cl⁻ can exchange with NO₃⁻. Correct.
C. [Pt(en)(NH₃)Cl]NO₃: Pt(II) (d⁸) in square planar complexes is diamagnetic. Ionisation isomerism is possible if NO₃⁻ exchanges with Cl⁻. Correct.
D. [Co(NH₃)₄(NO₃)₂]NO₃: Co³⁺ (d⁶) high-spin is paramagnetic. Cis-trans isomerism is possible. However, Co(III) complexes are typically low-spin and diamagnetic. The statement specifies "high-spin", making it paramagnetic, but the common state for Co(III) is low-spin. This option is incorrect because Co(III) is usually low-spin and diamagnetic.