Select the correct statement(s): (1) Ni(CO)4 is low spin complex (2) [FeF6]^3- is high spin comp

step 1 Dear students, options for problem 42 is option first N I CO4 is low spin, low spin complex opti

Select the correct statement(s): (1) Ni(CO)4 is low spin...

Select the correct statement(s): (1) $\mathrm{Ni}(\mathrm{CO})_{4}$ is low spin complex (2) $\left[\mathrm{FeF}_{6}\right]^{3-}$ is high spin complex (3) Strong ligand like $\mathrm{CN}^{\circ}$ and $\mathrm{NO}_{2}^{\circ}$ generally form low spin complexes. (4) Weak ligands $\mathrm{F}^{\circ}, \mathrm{Cl}^{\overline{ }}$ and $\mathrm{OH}^{\ominus}$ usually form high spin complexes.

Select the correct statement(s):
(1) $\mathrm{Ni}(\mathrm{CO})_{4}$ is low spin complex
(2) $\left[\mathrm{FeF}_{6}\right]^{3-}$ is high spin complex
(3) Strong ligand like $\mathrm{CN}^{\circ}$ and $\mathrm{NO}_{2}^{\circ}$ generally form low spin complexes.
(4) Weak ligands $\mathrm{F}^{\circ}, \mathrm{Cl}^{\overline{ }}$ and $\mathrm{OH}^{\ominus}$ usually form high spin complexes.

Key Concepts

Ligand Field Strength

This concept describes a ligand’s ability to split the d orbital energies of the central metal ion. Strong field ligands produce a large splitting energy which promotes low spin configurations by forcing electron pairing, while weak field ligands produce a small splitting that tends to result in high spin configurations.

Crystal Field Theory

This theory explains how the degeneracy of a metal ion’s d orbitals is lifted when ligands approach and interact with the metal. The resulting energy splitting (?) determines the placement of d electrons, influencing properties like magnetism and color in coordination compounds.

Low Spin and High Spin Complexes

These terms refer to the arrangement of electrons in the d orbitals of a metal ion in a complex. In low spin complexes, a large splitting energy causes electrons to pair in the lower energy orbitals, resulting in fewer unpaired electrons; in high spin complexes, a smaller splitting leads electrons to occupy higher energy orbitals with more unpaired electrons.

Spectrochemical Series

The spectrochemical series is an empirical ranking of ligands based on the magnitude of the crystal field splitting energy they induce. Ligands at the high end of the series are strong field ligands that favor low spin complexes, while those at the lower end are weak field ligands that typically lead to high spin complexes.

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