Nickel combines with a uninegative monodentate ligand \(\left(\mathrm{X}^{-}\right)\)to form a paramagnetic complex \(\left[\mathrm{NiX}_4\right]^{2-}\). The hybridisation involved and number of unpaired electrons present in the complex are respectively.

• Correct answer
  A

  \(\mathrm{sp}^3\) two
• B

  \(\mathrm{dsp}^2\), zero
• C

  \(\mathrm{dsp}^2\), one
• D

  \(\mathrm{sp}^3\), one

Solution

Hint : \(\mathrm{Ni}^{2+}\left(\mathrm{d}^8\right)\)
it should be paramagnetic with 2 unpaired electrons

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