Question

The $IUPAC$ name of the complex $\left[CrC{l}_2{\left(H_{2}O\right)}_4\right]N{O}_3$ is:

• A. Dichloridotetraaquachromium(III) nitrate
• B. Tetraaquadichloridochromium(III) nitrate
• C. Chromiumtetraaquadichloridonitrate
• D. Dichloridotetraaquachromium(II) nitrate

Answer 1

Answer: (B)

The correct I.U.P.A.C. name for $\left[CrC{l}_2{\left(H_{2}O\right)}_4\right]N{O}_3$ complex is tetraaquadichlorochromium(III) nitrate.
In this complex, water (aqua) is neutral ligand. $N{O}_3$ and $Cl$ has $-1$ charge. The oxidation state of chromium in this complex will be $+3$. Oxidation state is written in roman letters within the brackets. Nitrate ion is present outside the sphere so it will be named after naming the complex.