question_answer

Which one of the following complexes is an outer orbital complex? (Atomic numbers\[Mn=25,\,\,Fe=26,\,\,Co=27,\] \[Ni=28\])

A) \[{{[Fe{{(CN)}_{6}}]}^{4-}}\]                      

B) \[{{[Mn{{(CN)}_{6}}]}^{4-}}\]

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

D)        \[{{[Ni{{(N{{H}_{3}})}_{6}}]}^{2+}}\]

Correct Answer: D

Solution :

The complex in which nd orbitals are used in hybridisation, are called outer orbital complex. (a)\[{{[Fe{{(CN)}_{6}}]}^{4-}}=\] (b)\[{{[Mn{{(CN)}_{6}}]}^{4-}}=\] (c)\[{{[Co{{(N{{H}_{3}})}_{6}}]}^{3+}}=\] (d)\[{{[Ni{{(N{{H}_{3}})}_{6}}]}^{2+}}=\]