Question

The complex ion ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$ is :

• A. Square planar and diamagnetic
• B. Tetrahedral and paramagnetic
• C. Square planar and paramagnetic
• D. Tetrahedral and diamagnetic

Answer 1

Answer: (A)

Square planar and diamagnetic

$N{i}^{2+}$ ion has $3d^8$ outer electronic configuration. It undergoes $ds{p}^2$ hybridisation to form ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$ complex in which all the electrons are paired. Hence, it is diamagnetic.

The complex ion ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$ is square planar and diamagnetic.