Question

The proper name for $ [Co(NH_{3})_{6}]Cl_{3} $

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

Answer 1

Answer: (B)

$\left[ Co \left( NH _{3}\right)_{6}\right] Cl _{3}$
This is a cationic complex, so the name of the metal is written without any characteristic ending. Ligand is $NH _{3}$, 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.