Question

The correct name for the complex $\left[Cr{\left({NH}_3\right)}_6\right]\left[Co{\left(C_2{O}_4\right)}_3\right]$ is:

• A. hexaaminechromium(III) trioxalatocobalt (III)
• B. hexaamminechromate (III) trioxalatocobalate (III)
• C. hexaamminechromium (III) trioxalatocobaltate (III)
• D. hexaamminechromate (III) trioxalatocobalt (III)

Answer 1

Answer: (C)

hexaamminechromium (III) trioxalatocobaltate (III)

Since only negatively charged complex is named with suffix like ate,

${\left[Cr{\left(N{H}_3\right)}_6\right]}^{3+}{\left[{Co\left(C_2{O}_4\right)}_6\right]}^{3-}$

$\downarrow$ $\downarrow$

Chromium Cobaltate

Thus the IUPAC name of the complex compound will be:

hexaamminechromium (III) trioxalatocobaltate (III)