Question

The IUPAC name of $K_2\left[Cr\right(CN{)}_2{O}_2\left(O_2\right)N{H}_3]$ is:

• A. potassium amminedicyanotetraoxo chrominum (III)
• B. potassium amminedicyanodioxygendioxo chromate (IV)
• C. potassium amminedicyanosuperoxoperoxo chromate (III)
• D. potassium amminedicyanodioxoperoxo chromate (VI)

Answer 1

Answer: (D)

potassium amminedicyanodioxoperoxo chromate (VI)

The IUPAC name of $K_2\left[Cr\right(CN{)}_2{O}_2\left(O_2\right)N{H}_3]$ is Potassium amminedicyanodioxoperoxo chromate (VI).
The cation is potassium and the anion is the complex ion containing chromium metal in $+6$ oxidation state.
The oxidation state is written in roman numerals inside parenthesis.
The ligands $O$ and $O_2$ are oxo and peroxo respectively.
The prefix di indicates two.