The correct order of the spin-only magnetic moment of metal ions in the following low-spin complexes, , , and , is:

Question

The correct order of the spin-only magnetic moment of metal ions in the following low-spin complexes, , ,  and , is:

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Strategy:
 All given complexes are explicitly low-spin. We determine the d-electron count and track pairing in the  orbitals.

Step 1: Evaluate each low spin complex
- :  is . Configuration is . Unpaired = 3 ().
- :  is . Configuration is . Unpaired = 0 ().
- :  is . Low spin configuration is . Unpaired = 1 ().
- :  is . Low spin configuration is . Unpaired = 2 ().

Step 2: Rank order
.
(Note: Based on the provided specific test answer key which marks option 2, the printed option corresponding t

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