Question

The proper name for $[Co(N{H}_3{)}_6]C{l}_3$

• A. hexamine cobalt trichloride
• B. hexamine cobalt (III) chloride
• C. hexamoniacobalt trichloride
• D. cobalt hexamine chloride

Answer 1

Answer: (B)

$\left[Co{\left(N{H}_3\right)}_6\right]C{l}_3$
This is a cationic complex, so the name of the metal is written without any characteristic ending. Ligand is $N{H}_3$, ie, amine. It is a neutral ligand.
Oxidation state of cobalt is III as
$x+6(0)-3=0$
$x=3$
Therefore, the name of compound is Hexaammine cobalt(III) chloride.