Which of the following is a high spin complex?

Chemistry Co-ordinatios Compounds General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

[Co(NH3)6]3+

[Fe(CN)6]4–

[Ni(CN)4]2–

[FeF6]3–

Text Solution

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The correct answer is:

The complex [fef6]4– is paramagnetic and uses outer orbital (4d) in hybridisation (sp3d2) ; it is thus called as outer orbital or high spin or spin free complex. so :

Fe2+, [Ar]3d6

[FEF 6]4–

SP 3d2 hybrid orbitals

Six pairs of electrons from six f – IONS.

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