Q23 / 60 · IAT (IISER) 2017 · Chemistry

A complex of metal $\mathrm{M}^{n+}$ has the following electronic distribution in $d$ orbitals,
Figure
The neutral M has a ground state electronic configuration of $[\operatorname{Ar}] 4 \mathrm{~s}^2 3 \mathrm{~d}^6$. Which of the following complexes is consistent with the electronic distribution of $\mathrm{M}^{n+}$ (as described above)?

  • A
    $\left[\mathrm{M}(\mathrm{CN})_6\right]^{4-}$
  • Correct answer
    B
    $\left[\mathrm{MF}_6\right]^{3-}$
  • C
    $\left[\mathrm{MF}_6\right]^{4-}$
  • D
    $\left[\mathrm{M}(\mathrm{CN})_6\right]^{3-}$

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

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