Can f- act as strong field ligand and cause pairing of electron in Co(f6)3- ?

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Q. Assertion (A) : Number of unpaired electron in

F e (C O)_{5}

is four.
Reason (R) : CO is strong field ligand.

When does or in which complex water act as strong field ligands and when weak field ligand..

$C_{2} O_{4}^{2 -}$ is a weak ligand but acts as a strong ligand in $K_{3} [C o (C_{2} O_{4})_{3}]$ and induces the pairing of electrons against Hund's rule. Why?

Q. Assertion :Transition metal ion forming octahedral complexes undergo

s p^{3} d^{2}

d^{2} s p^{3}

hybridisation. Reason: Strong field ligands force the unpaired electrons of central metal ion to pair up causing

d^{2} s p^{3}

hybridisation whereas weak field ligands do not affect electronic configuration of the metal ion undergoes in

s p^{3} d^{2}

hybridisation.

Q. Assertion :

[F e (H_{2} O)_{6}]^{3 +}

is strongly paramagnetic whereas

[F e (C N)_{6}]^{3 -}

is weakly paramagnetic. Reason:

H_{2} O

is a week field ligand and

C N^{-}

is a strong field ligand.

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