A) \[{{\left[ \text{Co}\left( {{\text{H}}_{\text{2}}}{{\operatorname{O}}_{6}} \right) \right]}^{2+}}\]
B) \[{{\left[ \text{Co}\left( \operatorname{C}{{\operatorname{N}}_{6}} \right) \right]}^{3+}}\]
C) \[{{\left[ \text{Co}{{\left( {{\operatorname{C}}_{2}}{{O}_{4}} \right)}_{3}} \right]}^{3-}}\]
D) \[{{\left[ \text{Co}{{\left( \operatorname{N}{{\operatorname{H}}_{3}} \right)}_{6}} \right]}^{3+}}\]
Correct Answer: B
Solution :
Crystal field splitting depends upon the nature of ligand. The nature of ligand\[\Delta \] decreases as shown below \[{{C}_{2}}O_{4}^{--}<{{H}_{2}}O<N{{H}_{3}}<C{{N}^{-}}\] hence the crystal field splitting will be maximum for \[{{[Co{{(CN)}_{6}}]}^{3-}}\]
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