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Chemistry
The stability of complexes of Cu2+, Ni2+, Co2+ and Fe2+ varies in the order
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Q. The stability of complexes of $Cu^{2+}, Ni^{2+}, Co^{2+}$ and $Fe^{2+}$ varies in the order
The d-and f-Block Elements
A
$Cu^{2+} > Ni^{2+} > Co^{2+} > Fe^{2+}$
8%
B
$Cu^{2+} > Fe^{2+} > Ni^{2+} > Co^{2+}$
31%
C
$Ni^{2+} > Co^{2+} > Fe^{2+} > Cu^{2+}$
31%
D
$Cu^{2+} < Ni^{2+} < Co^{2+} < Fe^{2+}$
31%
Solution:
Smaller cations form more stable complexes. Ionic radii : $Cu^{2+} > Ni^{2+} > Co^{2+} > Fe^{2+}$
$\therefore \quad$ Stability : $Cu^{2+} > Ni^{2+} > Co^{2+} > Fe^{2+}$