Question

The $\ce{IUPAC}$ name of $\ce{[Co(NH3)6] [Cr(C2O4)3]}$ is

• A. hexaammine cobalt (III) tris (oxalato) chromium
• B. hexaammine cobalt (III) tris (oxalato) chromate (III)
• C. hexaammine cobalt tris (oxalato) chromium (III)
• D. hexaammine cobalt (III) chromium (III) oxalate

Answer 1

Answer: (B)

The complex exists as $\left[ Co \left( NH _{3}\right)_{6}\right]^{3+}\left[ Cr \left( C _{2} O _{4}\right)_{3}\right]^{3-}$
and named as 'Hexaammine cobalt(III) tris(oxalato) chromate(III)
Metal having a cation complex is named first followed by anionic complex.