Question:
Among the following complexes, the total number of diamagnetic species is ______.
[Mn(NH3)6]3+, [MnCl6]3−, [FeF6]3−, [CoF6]3−, [Fe(NH3)6]3+, and [Co(en)3]3+
[Given, atomic number: Mn = 25, Fe = 26, Co = 27;
en = H2NCH2CH2NH2]
Among the following complexes, the total number of diamagnetic species is ______.
[Mn(NH3)6]3+, [MnCl6]3−, [FeF6]3−, [CoF6]3−, [Fe(NH3)6]3+, and [Co(en)3]3+
[Given, atomic number: Mn = 25, Fe = 26, Co = 27;
en = H2NCH2CH2NH2]
[Mn(NH3)6]3+, [MnCl6]3−, [FeF6]3−, [CoF6]3−, [Fe(NH3)6]3+, and [Co(en)3]3+
[Given, atomic number: Mn = 25, Fe = 26, Co = 27;
en = H2NCH2CH2NH2]
Updated On: Mar 7, 2025
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Correct Answer: 1
Solution and Explanation
Step 1: Understanding Diamagnetism
- A species is diamagnetic if all its electrons are paired.
- Transition metal complexes can be classified based on their ligand field strength and electronic configuration.
Step 2: Electronic Configurations of the Metal Ions
- Mn3+: [Ar] 3d4
- Fe3+: [Ar] 3d5
- Co3+: [Ar] 3d6
Step 3: Determining the Magnetic Properties of Each Complex
- [Mn(NH3)6]3+ (NH3 is a weak field ligand, high-spin d4 configuration) → Paramagnetic
- [MnCl6]3− (Cl- is a weak field ligand, high-spin d4 configuration) → Paramagnetic
- [FeF6]3− (F- is a weak field ligand, high-spin d5 configuration) → Paramagnetic
- [CoF6]3− (F- is a weak field ligand, high-spin d6 configuration) → Paramagnetic
- [Fe(NH3)6]3+ (NH3 is a weak field ligand, high-spin d5 configuration) → Paramagnetic
- [Co(en)3]3+ (en is a strong field ligand, low-spin d6 configuration) → Diamagnetic
Step 4: Conclusion
- Only [Co(en)3]3+ is diamagnetic.
- Total number of diamagnetic species = 1.
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