Question:

$[FeF_{6}]^{3-}$ is paramagnetic due to presence of unpaired electrons in the complex. The five electrons remain unpaired because

Updated On: Jul 6, 2022
  • fluorine is the most electronegative element
  • $F^{-}$ is a weak field ligand hence does not cause pairing of electrons
  • $F^{-}$ is a strong field ligand hence does not cause pairing of electrons
  • pairing does not take place in iron complexes
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The Correct Option is B

Solution and Explanation

$F^{-}$ is a weak field ligand hence it does not cause pairing of electrons. $[FeF_{6}]^{3-}$ :
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Notes on coordination compounds

Concepts Used:

Coordination Compounds

A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.

Coordination entity:

A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.

Ligands:

A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.