Question

In which of the following, the chemical formula and the name are incorrectly matched?

• A. $K\left[Pt\left(N{H}_3\right)C{l}_5\right]$ - potassium amminepentachloroplatinate(IV)
• B. ${\left[Ag{\left(CN\right)}_2\right]}^{-}$- dicyanoargentate(I) ion
• C. $K_3\left[Cr{\left(C_2{O}_4\right)}_3\right]$ - potassium trioxalatochromate(III)
• D. $N{a}_2\left[Ni\left(EDTA\right)\right]$ - sodium ethylenediaminetetraacetonickelate(IV)

Answer 1

The correct option is D $N{a}_2\left[Ni\left(EDTA\right)\right]$ - sodium ethylenediaminetetraacetonickelate(IV)

The correct IUPAC name of compound ${Na}_2\left[Ni\right(EDTA\left)\right]$ is sodium ethylenediaminetetraacetonickelate(II).

Let $x$ be the oxidation state of $Ni$.

In this compound, the complex has $-2$ charge and $EDTA$ has $-4$ charge, hence $x-4=-2$, which gives $x=+2$ which is the oxidation number of $Ni$.

But given option D is incorrect oxidation state.