The order of stability of complexes of ion Cu+2, Ni+2, Mn+2 and Fe+2 decreases in the order -
Cu+2 > Ni+2 > Fe+2 > Mn+2
Mn+2 > Ni+2 > Cu+2 > Fe+2
Ni+2 > Cu+2 > Fe+2 > Mn+2
Fe+2 > Ni+2 > Cu+2 > Mn+2
The order of stability of the complexes of some of the ions carrying the same charge but differing in ionic radii decrease as the ionic radii increase.
ion Cu+2, Ni+2, Fe+2 , Mn+2
Ionic radii 0.69 0.78 0.83 0.91
The complexes of Cu+2 are most stable while Mn+2 is least stable.
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