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प्रश्न
Which one of the following complexes is an outer orbital complex?
पर्याय
[Fe(CN)6]4−
[Mn(CN)6]4−
[Co(NH3)6]3+
[Ni(NH3)6]2+
MCQ
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उत्तर
[Ni(NH3)6]2+
Explanation:
In [Ni(NH3)6]2+, Ni2+ is 3d8 and NH3 is a weak-field ligand; no pairing of d-electrons occurs. The complex uses outer 4d orbitals for hybridisation (sp3d2), making it an outer orbital complex. The others have strong-field ligands (NH3 with Co3+, CN−) that cause pairing and use inner (3d) orbitals, forming inner orbital complexes.
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