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