Question

Which of the following is not expected to show paramagnetism?

• A. $\left[Ni\right(H_{2}O){]}^{2+}$
• B. $Ni(CO{)}_4$
• C. $\left[Ni\right(N{H}_3{)}_4{]}^{2+}$
• D. $\left[Co\right(N{H}_3{)}_6{]}^{2+}$

Answer 1

The correct option is B $Ni(CO{)}_4$

$Ni(CO{)}_4$ is not expected to show paramanetism due to absence of unpaired electrons.
Electronic configuration of $Ni$ is $[Ar{]}_{18}3d^{8}4s^2$.