Q4 / 170 · Manipal (MET) 2020 · Chemistry

Which of the following complexes is an outer orbital complex?

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

Solution

A. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{+3}$ inner orbital $\left(d^2 s p^3\right)$ complex B. $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$ inner orbital $\left(d^2 s p^3\right)$ complex C. $\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}$ outer orbital $\left(s p^3 d^2\right)$ complex D. $\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{2-}$ inner orbital $\left(d^2 s p^3\right)$ complex

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

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