(i) Fe exists in +3 oxidation state in [Fe(CN)6]3-.
Electronic configuration of Fe+3 = 3d5
As CN is a strong field ligand, there will be pairing of electrons in d orbital.
Hybridization and shape of [Fe(CN)6]3- is d2sp3 and octahedral respectively.
Since, there is one unpaired electron present therefore, the complex is paramagnetic in nature.
(ii) IUPAC name of [Co(NH3)5NO2] (NO3)2 is Pentaamminenitrocobalt(III) nitrate. The oxidation state of cationic part is +2 thus, oxidation state of metal is +2+1 = 3.
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