Number of complexes from the following with even number of unpaired "d" electrons is
, , , ,
(At. no.: V=23, Cr=24, Fe=26, Ni=28, Cu=29)

Question

Number of complexes from the following with even number of unpaired "d" electrons is 
, , , , 
(At. no.: V=23, Cr=24, Fe=26, Ni=28, Cu=29)

Canvas Classes · Accepted Answer

Strategy:
 With water () acting as a weak field ligand, all complexes will form high-spin states. We must find the d-electron count for each metal ion and determine the number of unpaired electrons.

Step 1: Determine unpaired electrons () for each ion
- :  is   2 unpaired electrons (Even).
- :  is   4 unpaired electrons (Even).
- :  is   5 unpaired electrons (Odd).
- :  is     3 unpaired electrons (Odd).
- :  is   1 unpaired electron (Odd).

Step 2: Conclusion
The complexes with an even number

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