The charge on cobalt in${\left[\mathrm{Co}{\left(\mathrm{CN}\right)}_6\right]}^{-3}$ is -

An ion called a cyanide (CN ) has a charge of-1. There are 6 cyanide molecules present, hence their combined charge is 6.

Let x represent the cobalt (Co) charge in this chemical.

Since the molecule's overall charge is 3, we may build up an equation to get cobalt's charge, or discover x.

x+(−6)=−3

x−6=−3

x=3

As a result, the cobalt charge in this compound is +3.