The experimentally observed magnetic moment values, which match well with the spin-only values for the pair of aqueous ions is
(Atomic number : Cr = 24, Co = 27, Gd = 64, Tb = 65, Dy = 66 and Lu = 71)
1
Cr(III) Gd(III)
2
Co(II) and Gd(III)
3
Cr(III) and Dy(III)
4
Lu(III) and Tb (III)
5
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