Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers: \(Mn = 25; Fe = 26\))
(1) \([FeF_6]^{3–}\)
(2) \([Fe(CN)_6]^{3–}\)
(3) \([MnCl_6]^{3–}\) (high spin)
(4) \([Mn(CN)_6]^{3–}\)
(1) \([FeF_6]^{3–}\)
(2) \([Fe(CN)_6]^{3–}\)
(3) \([MnCl_6]^{3–}\) (high spin)
(4) \([Mn(CN)_6]^{3–}\)
- 1 < 2 < 4 < 3
- 2 < 4 < 3 < 1
- 1 < 3 < 4 < 2
- 2 < 4 < 1 < 3
The Correct Option is B
Solution and Explanation
| \(Coordination\; Compound\) | \(Number \;of \;unpaired \;e^– (n)\) | \(Magnetic \;moment \;(μ) (B.M)\) |
|---|---|---|
| \(A\;[FeF_6]^{3–} – d^5\) | 5 | 5.91 |
| \(B\; [Fe(CN)_6]^{3–} – d^5\) | 1 | 1.73 |
| \(C \;[MnCl_6]^{3–} – d^4\) | 4 | 4.89 |
| \(D\; [Mn(CN)_6]^{3–} – d^4\) | 2 | 2.82 |
Hence, the correct order of magnetic moment is \(2 < 4 < 3 < 1\)
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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.