Arrange the following coordination compounds in the increasing order of magnetic moments (Atomic numbers: Mn=25, Fe=26):
A. B. C. (high spin) D.

Question

Arrange the following coordination compounds in the increasing order of magnetic moments (Atomic numbers: Mn=25, Fe=26):
A.   B.   C.  (high spin)  D.

Canvas Classes · Accepted Answer

Strategy:
 Calculate the number of unpaired electrons () for each complex to find their respective spin-only magnetic moments (), then order them.

Step 1: Evaluate each complex
- A. :  (), weak field  high-spin  5 unpaired electrons.
- B. :  (), strong field  low-spin  1 unpaired electron.
- C. : Given as high-spin.  (), high-spin  4 unpaired electrons.
- D. :  (), strong field  low-spin ()  2 unpaired electrons.

Step 2: Order according to unpaired electrons
1 (B) < 2 (D) < 4 (C) < 5 (A).
So,

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