The pair of metal ions that can give a spin-only magnetic moment of 3.9 BM for the complex is :
Magnetic Moments (spin only) -
where n= number of the unpaired electron.
Number of unpaired and corresponding magnetic moments
as we knoe that
we haew iearned in crystalfield theory accoeding to CFT ,H2O is a weak ligand
3unpaired electron spin only magnetic moment= 3.89 BM
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