Question

In which of the following complexes of the Co (at. no. 27), will the magnitude of $\Delta_{\textdegree}$ be the hightest?
(a) [Co(CN)₆]³⁻
(b) [Co(C₂O₄)₃]³⁻
(c) [Co(H₂O)6]³⁺
(d) [Co(NH₃)6]³⁺

Answer 1

The increasing field strength is as

I−<Br−<Cl−<F−<OH−H20<C2O2−4<NH3<en<NO−2<CN−

(A)[CO(CN)6]3−

Answer 2

I−<Br−<Cl−<F−<OH−H20<C2O2−4<NH3<en<NO−2<CN−

(A)[CO(CN)6]3−