Q9 / 110 · VITEEE 2022 · Chemistry

Which one of the following will show paramagnetism corresponding to 2 unpaired electrons?(Atomic numbers: \(\mathrm{Ni}=28, \mathrm{Fe}=26\))

  • A
    \(\left[\mathrm{Fe} \mathrm{F}_6\right]^{3-}\)
  • Correct answer
    B
    \(\left[\mathrm{NiCl}_4\right]^{2-}\)
  • C
    \(\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}\)
  • D
    \(\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}\)

Solution

As in \(\left[\mathrm{NiCl}_4\right]^{-2}\) Chloride ion being a weak ligand is not able to paired the electron in \(\mathrm{d}\) orbital.

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

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