Chemistry - Coordination Chemistry Question with Solution | TestHub
Which of the following inner orbital complex(es) is/are paramagnetic.
Options:(select one or more)
Answer:
Solution:
To determine if a complex is paramagnetic, we need to find the number of unpaired electrons. Inner orbital complexes utilize inner d-orbitals for bonding.
A. : Co³⁺ is d⁶. F⁻ is a weak field ligand. It forms an outer orbital complex, not an inner orbital complex. High spin, 4 unpaired electrons. Paramagnetic.
B. : Cr³⁺ is d³. H₂O is a weak field ligand, but for d³ systems, it always forms an inner orbital complex. 3 unpaired electrons. Paramagnetic.
C. : Pt²⁺ is d⁸. Square planar complexes of d⁸ ions are typically diamagnetic (0 unpaired electrons). This is an inner orbital complex. Diamagnetic.
D. : Co²⁺ is d⁷. 'en' (ethylenediamine) is a strong field ligand. It forms an inner orbital complex. The d⁷ electrons pair up to give 1 unpaired electron. Paramagnetic.
Therefore, complexes B and D are paramagnetic inner orbital complexes.
