A) \[{{[Co\,{{(CN)}_{6}}]}^{3-}}\]
B) \[{{[Co\,{{({{C}_{2}}{{O}_{4}})}_{3}}]}^{3-}}\]
C) \[{{[Co\,{{({{H}_{2}}O)}_{6}}]}^{3+}}\]
D) \[{{[Co\,{{(N{{H}_{3}})}_{6}}]}^{3+}}\]
Correct Answer: A
Solution :
Crystal field splitting energy for octahedral complex, \[{{\Delta }_{0}}\] depends upon the strength of negative ligand. The strength of splitting is as: \[CO>C{{N}^{-}}>NO_{2}^{-}>en>N{{H}_{3}}>Py>NC{{S}^{-}}>{{H}_{2}}O\] \[>{{O}^{2-}}>O{{X}^{2-}}>O{{H}^{-}}>{{F}^{-}}>C{{l}^{-}}\] \[>SC{{N}^{-}}>{{S}^{2-}}>B{{r}^{-}}>{{I}^{-}}\]
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