The correct statement about the magnetic properties of [Fe(CN)6]3- and [FeF6]3- is
- Both are paramagnetic
- Both are diamagnetic
- [Fe(CN)6]3- is diamagnetic,[FeF6]3- is paramagnetic
- [Fe(CN)6]3- is paramagnetic,[FeF6]3- is diamagnetic
The Correct Option is A
Solution and Explanation
To determine the magnetic properties of the complexes [Fe(CN)6]3− and [FeF6]3−, we need to consider:
- Oxidation state of Fe
- Type of ligand (strong field or weak field)
- Electronic configuration and spin pairing
Step 1: Oxidation state of Fe
- In both complexes, Fe is in +3 oxidation state.
- Atomic number of Fe = 26 → Fe3+ = 3d5
Step 2: Analyze each complex
1) [Fe(CN)6]3−:
- CN− is a strong field ligand (causes pairing of electrons).
- In an octahedral field, the 3d5 electrons will pair due to strong field effect.
- Configuration: t2g5 eg0
- Number of unpaired electrons = 1 → Paramagnetic
2) [FeF6]3−:
- F− is a weak field ligand (no pairing).
- Electrons remain unpaired.
- Configuration: t2g3 eg2
- Number of unpaired electrons = 5 → Paramagnetic
Conclusion: Both complexes have unpaired electrons → Both are paramagnetic
Correct answer: (A) Both are paramagnetic
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.