Question

The geometry and magnetic behaviour of the complex $\left[Ni\right(CO{)}_4]$ are

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

Answer 1

The correct option is B Tetrahedral geometry and diamagnetic

$Ni\left(28\right):\left[Ar\right]3d^{8}4s^2$
$\because$ $CO$ is a strong field ligand
Configuration would be:

The hybridisation would be $s{p}^3$ and thus the complex would be diamagnetic and would possess tetrahedral geometry.