The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively : [Fe(CN)6]3–, [FeF6]3–, [CoF6]3–, [Mn(CN)6]3– (A) 1, 5, 5, 2 (B) 1, 4, 4, 2

Question

The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively : [Fe(CN)6]3–, [FeF6]3–, [CoF6]3–, [Mn(CN)6]3–

(A) 1, 5, 5, 2
(B) 1, 4, 4, 2
(C) 1, 5, 4, 2
(D) 1, 1, 4, 2

Prashant Kotian · Accepted Answer

Correct answer: C. [Fe(CN)6]3– Fe3+ 3d5 ,2 ,2 g 2t eg0, 0 unapired e– = 1 [FeF6]3– Fe3+ 3d5 ,1 ,1 g 2t eg1, 1 unapired e– = 5 [CoF6]3– Co3+ 3d6 ,1 ,2 g 2t eg1, 1 unapired e– = 4 [Mn(CN)6]3– Mn3+ 3d4 ,1 ,2 g 2t eg0, 0 unapired e– = 2

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