Question:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
A ⇒ Spin only magnetic moment of [Fe(CN)6]–3 is 1.73 B.M. and [Fe(H2O)6]+3 is 5.92 B.M.
R ⇒ In both cases Fe have +3 oxidation state
In the light of the above statements, write the detailed answer:

Updated On: Feb 15, 2024
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Approach Solution - 1

[Fe(CN)6]–3 : Fe+3 : 3d5 with S.F.L 
n=1 ⇒ n = 1 
Magnetic moment = 1.731.73  B.M [Fe(H2O)6]+3 Fe+3 : 3d5 with W.F.L 
n=5 ⇒ n = 5 
Magnetic moment = 5.925.92 B.M 

Both A & R are correct but R is not the correct explanation \text{Both A \& R are correct but R is not the correct explanation }

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Approach Solution -2

The magnetic moment of [Fe(H2O)6]3+[Fe(H_2O)_6]^{3+} is 5.92 BM because it has high-spin Fe3+ (d5, S = 52\frac{5}{2}) and it has five unpaired electrons. 
On the other hand, [Fe(CN)6]3[Fe(CN)_6]^{3-} has low-spin Fe3+ (d5, S = 12\frac{1}{2}) and only one unpaired electron. 
Therefore, the magnetic moment of [Fe(CN)6]3[Fe(CN)_6]^{3-} is 1.73 BM, which is much lower than that of [Fe(H2O)6]3+[Fe(H_2O)_6]^{3+}
The oxidation state of Fe in both complexes is indeed +3.\text{The oxidation state of Fe in both complexes is indeed +3.}

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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.