Select the correct IUPAC name of     $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\right({\mathrm{CO}}_3\left)\right] \mathrm{Cl}$
 

 $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\right({\mathrm{CO}}_3\left)\right] \mathrm{Cl}$

Here complex ion is a cation of the Cobalt metal. 
The charge on the coordination entity is +1. 
${\mathrm{NH}}_3$ is a neutral ligand. 
The charge of ${\mathrm{CO}}_3$is -2. 
Let the charge of Co is x. 
So, $\mathrm{x}+(-2)=1$
$\Rightarrow \mathrm{x}-2=1$

$\Rightarrow \mathrm{x}=+3$
The oxidation state of the metal is in the Roman numeral. 
${\mathrm{CO}}_3$ is an anionic ligand and its IUPAC name is carbonate. 
 ${\mathrm{NH}}_3$ is called ammine. 
Prefixes are utilized for the indication of individual ligands. 
The ligands are named in alphabetical order followed by the complex ion. 
There is no separation in the IUPAC name. 

Thus, the IUPAC name is C) Pentamminecarbonatecobalt (III) chloride.