Atomic numbers of Mn, Fe, and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic?
A: [Co(NH3)6]3+
B: [Mn(CN)6]3-
C: [Fe(CN)6]4-
D: [Fe(CN)6]3-
Atomic numbers of Mn, Fe, and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic?
A: [Co(NH3)6]3+
B: [Mn(CN)6]3-
C: [Fe(CN)6]4-
D: [Fe(CN)6]3-
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1 Answer
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This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Correct option: A and C
(i) Orbitals of Co3+ ion d2sp3 hybridised orbitals of Co3+ [Co (NH3)6]3+ (inner orbital or low spin complex)
No. of unpaired electron =0
Magnetic property = diamagnetic, due to absence of unpaired electrons
(ii) Electronic configuration is 3 d6 orbitals of Fe2+ ion:
As CN−is a strong field ligand, it causes the pairing of the unpaired 3d electrons. Since there are six ligands around the central metal ion, the most feasible hybridization d2sp3⋅d2sp3 hybridized oribtals of Fe2+ are:6 electron pairs from CN− ions occupy the s
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