Question

Which of the following is anionic complex?

• A. Potassium hexa nitro cobalatate (III)
• B. Sodium dicyano argenate (I)
• C. Ferric ferrocyanide
• D. All the above

Answer 1

The correct option is D All the above

Anionic complex compounds are those which have a negative charge on complex sphere. The easiest way to find this is by not looking at the coordination sphere, look at what is present other than the sphere. In the above cases there are cations like $K^{+},N{a}^{+}$ and $F{e}^{3+}$ present. Hence all of them are anionic compounds.