Why does pairing takes place in hexaaquacobalt(III) complex even in presence of weak field ligand ?

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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. The stable oxidation state of Cr in the presence of a weak field ligand is:

Q. A d-block element forms an octahedral complex but its spin magnetic moment remains the same in the presence of both strong field and weak field ligands. Which of the following is/are correct?

In complexes of weak field ligands,

Δ_{o} < P

(pairing energy), the energy difference between

t_{2 g}

and

e_{g}

sets is relatively less. Under the influence of strong field ligands,

Δ_{o} > P

(pairing energy), the energy difference between

t_{2 g}

and

e_{g}

sets is relatively high.

The correct statement regarding

[C r (e n)_{2} C l_{2}]^{+}

and

[C o (C_{2} O_{4})_{2} (N H_{3})_{2}]^{-}

complex ions is :

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