40. d4 to d7 co ordination entities are more stable for strong field as compared to weak field cases(in case of octahedral complexes) Why? And how?

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On the basis of crystal field theory explain why Co(III) forms paramagnetic octahedral complex with weak field ligands whereas it forms diamagnetic octahedral complex with strong field ligands.

Q. Which of the following statement(s) is are true regarding

d^{7}

configuration of octahedral complex in presence of strong field igand?

Q. What will be the CFSE value of

d^{7}

configuration of octahedral complex in presence of strong field igand?

Q. The magnetic moments of following, arranged in increasing order will be:

[atomic number of Co = 27]

(1)

C o^{3 +}

(octahedral complex with a strong field ligand)

(2)

C o^{3 +}

(octahedral complex with a weak field ligand)

(3)

C o^{2 +}

(tetrahedral complex)

(4)

C o^{2 +}

(square planar complex)

Q. Crystal field stabilization energy for high spin

d^{4}

octahedral complex is:

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