On the basis of CFT predict the number of unpaired electrons in [CrF6]3-. - Chemistry

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MCQ

On the basis of CFT predict the number of unpaired electrons in [CrF6]3-.

Options

  • 1

  • 2

  • 3

  • 4

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Solution

3

Explanation:

The[CrF6]3- complex contains a chromium ion with a +3 oxidation state. In this state, chromium has an electron configuration of 3d3, meaning there are three electrons in the d orbitals.

According to Crystal Field Theory for an octahedral complex, the d-orbitals split into two sets: t2g​ (lower energy) and eg​ (higher energy). Fluorine ligands are considered weak field ligands, and they cause a small energy gap between the t2g​ and eg​ orbitals.

A chromium ion with three d-electrons will fill the three t2g orbitals with one electron each to minimize repulsion, according to Hund's rule. As a result, all three d-electrons are unpaired.

Therefore, the [CrF6]3- complex has three unpaired electrons.

Concept: Theories of Bonding in Complexes
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Chapter 9: Coordination Compounds - Exercises [Page 207]

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Balbharati Chemistry 12th Standard HSC for Maharashtra State Board
Chapter 9 Coordination Compounds
Exercises | Q 1.6 | Page 207

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