question_answer

The species having tetrahedral shape is

A)  \[{{[PdC{{l}_{4}}]}^{2-}}\]   

B)         \[{{[Ni{{(CN)}_{4}}]}^{2-}}\]

C)                         \[Pd{{(CN)}_{4}}{{]}^{3-}}\]   

D)         \[{{[NiC{{l}_{4}}]}^{2-}}\]

Correct Answer: D

Solution :

\[Ni(28)=3{{d}^{8}}\,\,4{{s}^{2}}\] \[N{{i}^{2+}}=3{{d}^{8}}\,\,4{{s}^{0}}\] Here \[\times \,\times \] represents electron pairs donated by \[C{{l}^{-}}\]ion. \[{{[NiC{{l}_{4}}]}^{2-}}\] 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.