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# Which one of the following complexes is an outer orbital complex

$\begin{array}{1 1}(a)\;[Fe(CN)_6]^{4-}&(b)\;[Ni(NH_3)_6]^{2-}\\(c)\;[CO(NH_3)_6]^{2-}&(d)\;[Mn(CN)_6]^{4-}\end{array}$

$[Ni(NH_3)_6]^{2-}$
Hence (b) is the correct answer.