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Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour ?
(At. Nos : Cr = 24, Mn = 25, Fe = 26, Co = 27)
  • a)
    [Co(CN)6]3-
  • b)
    [Fe(CN)6]3-
  • c)
    [Mn(CN)6]3-
  • d)
    [Cr(CN)6]3 -
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Which one of the following cyano complexes would exhibit the lowest va...
The effective magnetic moment is given by the number of unpaired electrons in a substance, the lesser the number of unpaired electrons lower is its magnetic moment in Bohr – Magneton and lower shall be its paramagnetism
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Which one of the following cyano complexes would exhibit the lowest va...

Paramagnetic Behaviour of Cyano Complexes

Explanation:
- Paramagnetic behavior is due to the presence of unpaired electrons in a complex.
- The number of unpaired electrons can be calculated using Crystal Field Theory.

[Co(CN)6]3-
- Co(III) has 6 d electrons.
- Cyanide ions act as strong field ligands, causing pairing of electrons in the t2g orbitals.
- Therefore, [Co(CN)6]3- will have 0 unpaired electrons and exhibit the lowest paramagnetic behavior.

[Fe(CN)6]3-
- Fe(III) has 5 d electrons.
- Cyanide ions are strong field ligands, causing high spin complex formation.
- The complex will have 5 unpaired electrons, exhibiting higher paramagnetic behavior than [Co(CN)6]3-.

[Mn(CN)6]3-
- Mn(III) has 4 d electrons.
- Cyanide ions are strong field ligands, causing pairing of electrons in the t2g orbitals.
- Therefore, [Mn(CN)6]3- will have 2 unpaired electrons, exhibiting higher paramagnetic behavior than [Co(CN)6]3-.

[Cr(CN)6]3-
- Cr(III) has 3 d electrons.
- Cyanide ions are strong field ligands, causing pairing of electrons in the t2g orbitals.
- Therefore, [Cr(CN)6]3- will have 3 unpaired electrons, exhibiting higher paramagnetic behavior than [Co(CN)6]3-.
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Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour ?(At. Nos : Cr = 24, Mn = 25, Fe = 26, Co = 27)a)[Co(CN)6]3-b)[Fe(CN)6]3-c)[Mn(CN)6]3-d)[Cr(CN)6]3 -Correct answer is option 'A'. Can you explain this answer?
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