question_answer

The number of unpaired electrons in \[\text{Ni(CO}{{\text{)}}_{\text{4}}}\]

A)  0            

B)                         1

C)  3                            

D)         4

Correct Answer: A

Solution :

Oxidation state of Ni in \[\text{Ni(CO}{{\text{)}}_{\text{4}}}\]is zero.                 \[\therefore \] no unpaired electrons present in \[Ni{{(CO)}_{4}}.\]