Question

In $Ni{\left(CO\right)}_4$ the oxidation state of Ni is:

• A. 4
• B. 0
• C. 2
• D. 8

Answer 1

The correct option is B 0

Let the oxidation state of $Ni$ be $x$.

The oxidation states of $CO$ is $0$.

$\therefore$ $x+0=0$

$\therefore$ $x=0$

Hence, the oxidation state of $Ni$ in ${Ni\left(CO\right)}_4$ is zero.