Question:

Which one of the following shows maximum paramagnetic character?

Updated On: Aug 1, 2022
  • $\left[ Fe ( CN )_{6}\right]^{3-}$
  • $\left[ Fe ( CN )_{6}\right]^{4-}$
  • $\left[ Cr \left( H _{2} O \right)_{6}\right]^{3+}$
  • $\left[ Cu \left( H _{2} O \right)_{6}\right]^{2+}$
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The Correct Option is C

Solution and Explanation

Due to strong ligand $i . e$. cyanide ion, $3 d$ electrons pair up.
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so only one unpaired electron. Due to strong ligand $CN , e ^{-}$ pair up
$\therefore$ No unpaired electron
As $H _{2} O$ is weak ligand, no pairity of electron takes place.
$\therefore$ Three unpaired electrons.
only one unpaired electron.
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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.