Question:
The $d$ electron configuration of $Cr ^{2+}, Mn ^{2+}, Fe ^{2+}$ and $Ni ^{2+}$ are $3 d ^{4}, 3 d ^{5}, 3 d ^{6}$ and $3 d ^{8}$ respectively.
Which one of the following aqua complex will exhibit the minimum paramagnetic behaviour?
(At. Nos. $Cr =24, Mn =25, Fe =26, Co =27$ )
The $d$ electron configuration of $Cr ^{2+}, Mn ^{2+}, Fe ^{2+}$ and $Ni ^{2+}$ are $3 d ^{4}, 3 d ^{5}, 3 d ^{6}$ and $3 d ^{8}$ respectively.
Which one of the following aqua complex will exhibit the minimum paramagnetic behaviour?
(At. Nos. $Cr =24, Mn =25, Fe =26, Co =27$ )
Updated On: Aug 20, 2024
- $[Fe(H_2O)_6]^{2+}$
- $\left[ Ni \left( H _{2} O \right)_{6}\right]^{2+}$
- $[Co(H_2O)_6]^{2+}$
- $[Mn(H_2O)_6]^{2+}$
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The Correct Option is C
Solution and Explanation
As magnetic moment is $\sqrt{n(n+2)}$ where $n$ is no. of unpair electron.
So ion with minimum no. of unpair electron will have minimum paramagnetism.
$=\left[ Co \left( H _{2} O \right)_{6}\right]^{2+}$ have minimum paramagnetic behaviour.
So ion with minimum no. of unpair electron will have minimum paramagnetism.
$=\left[ Co \left( H _{2} O \right)_{6}\right]^{2+}$ have minimum paramagnetic behaviour.
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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.