Given following complexes:
(I) 
(II) 
(III) 
(IV) 
The correct order of spin only magnetic moment for the above complexes
(II) 
(IV) 
(I) 
(IV) 
(III) 
(I) 
I 
III 
(III) 
(II) 
II 
I 
(IV) 
(III)
Text Solution
Verified by ExpertsA
Complex (I) has the central metal ion as 
with strong field ligands.
Configuration of 
Strong field ligands will pair up all the electrons and hence the magnetic moment will be zero.
Complex (II) has the central metal ion as 
with weak field ligands.
Configuration of 
As weak field ligands are present, pairing does not take place. There will be 4 unpaired electrons and hence the magnetic moment 
B.M.
Complex (III) has the central metal ion as 
with weak field ligands.
Configuration of 
As weak field ligands are present no pairing can occur. There will be 3 unpaired electrons and hence the magnetic moment 
B.M.
Complex (IV) has the central metal ion as 
with strong field ligands.
Configuration of 
Strong field ligands will pair up the electrons but as we have a 
configuration, one electron will remain unpaired and hence the magnetic moment will be 
B.M.
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