Question

The species having tetrahedral shape is

• A. ${\left[PdC{l}_4\right]}^{2-}$
• B. ${\left[Ni(CN{)}_4\right]}^{2-}$
• C. ${Pd(CN{)}_4]}^{3-}$
• D. ${\left[NiC{l}_4\right]}^{2-}$

Answer 1

Answer: (D)

$Ni(28)=3d^{8}4s^2$
$N{i}^{2+}=3d^{8}4s^0$

Here $XX$ represents electron pairs donated by $C{l}^{-}$ion. ${\left[NiC{l}_4\right]}^{2-}$ shows paramagnetic characteristics due to the presence of two unpaired electrons. The $3d$ orbitals remain undisturbed because $C{l}^{-}$ligand is weak field ligand therefore, $N{i}^{2+}$ ion undergoes $s{p}^3$ hybridisation resulting in tetrahedral structure of the complex.