question_answer

    In which of the following complex ion, the central metal ion is in a state of\[s{{p}^{3}}{{d}^{2}}\] hybridisation?

A)  \[{{[Co{{F}_{6}}]}^{3-}}\]            

B)  \[{{[Co{{(N{{H}_{3}})}_{6}}]}^{3+}}\]

C)  \[{{[Fe{{(CN)}_{6}}]}^{3-}}\]                     

D)  \[{{[Cr{{(N{{H}_{3}})}_{6}}]}^{3+}}\]

Correct Answer: A

Solution :

                Electronic configuration of\[C{{o}^{2+}}\]ion \[{{F}^{-}}\]is a weak ligand. It cannot pair up electrons with \[d-\]subshell and forms outer orbital octahedral complex. \[{{[Co{{(N{{H}_{3}})}_{6}}]}^{3+}}\]ion \[N{{H}_{3}}\]and\[C{{N}^{-}}\]are strong ligands. So, they form inner orbital complex.