Q.

According to Valence bond theory,  which of the following is an example of outer orbital complex

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a

K3FeF6

b

CoNH36Cl3

c

K4FeCN6

d

K3CoNO26

answer is A.

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Detailed Solution

CN-, NO2-, NH3  are strong field ligands and form inner orbital complexes;  FeF6−3 is an example of outer orbital complex.  F-  is a weak field ligand.No pairing occurs against Hund’s rule.
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