Question

Which of the following are sets of diamagnetic species ?

• A. $TiC{l}_4,O_2,\left[Ni\right(CN{)}_4{]}^{2-},\left[Ni\right(H_2{O}_4{]}^{2+}$
• B. $TiC{l}_4,\left[Ni\right(CN{)}_4{]}^{2-},CO,\left[Ni\right(H_2{O}_4{]}^{2+}$
• C. $TiC{l}_4,\left[Ni\right(CN{)}_4{]}^{2-},CO$
• D. $TiC{l}_4,O_2,\left[Ni\right(CN{)}_4{]}^{2-},O_2$

Answer 1

The correct option is C $TiC{l}_4,\left[Ni\right(CN{)}_4{]}^{2-},CO$

$TiC{l}_4,\left[Ni\right(CN{)}_4{]}^{2-},CO$ are diamagnetic species as all the electrons are paired.
$T{i}^{4+}$ has $3d^0$ electronic configuration, $N{i}^{2+}$ has $3d^8$ electronic configuration, it undergoes $ds{p}^2$ hybridization.
CO has the structure $:C\equiv O:$