The calculated spin-only magnetic moments (BM) of the anionic and cationic species of and respectively, are:

Question

The calculated spin-only magnetic moments (BM) of the anionic and cationic species of  and  respectively, are:

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Strategy:
 Determine the number of unpaired electrons () for both the cationic and anionic iron complexes, then calculate their magnetic moments.

Step 1: Analyze the Cationic Species 
-  ().
-  is a weak field ligand  high-spin complex.
- Distribution: . Unpaired electrons () = 4.
- .

Step 2: Analyze the Anionic Species 
-  ().
-  is a strong field ligand  low-spin complex.
- Distribution: . Unpaired electrons () = 0.
- .

Step 3: Match with options
The question asks for the moments of the ani

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