Q16 / 170 · Manipal (MET) 2017 · Chemistry

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

  • A
    $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$
  • B
    $\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{4-}$
  • C
    $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$
  • Correct answer
    D
    $\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}$

Solution

Complex ion Hybridisation on central atom $\begin{aligned} & {\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-} \quad d^2 s p^3 \text { (Inner) }} \\ & {\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{4-} d^2 s p^3 \text { (Inner) }} \\ & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}} \\ & d^2 s p^3 \text { (Inner) } \\ & {\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+} s p^3 d^2 \text { (Outer) }} \end{aligned}$

Hence, the correct answer is option: 'D'.

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