Question

Which is a coordination compound?

• A. Ferrous ammonium sulphate
• B. Carnallite
• C. Potassium ferrocyanide
• D. Gypsum

Answer 1

The correct option is C Potassium ferrocyanide

Only 'Potassium ferrocyanide' $(i.e.K_3[Fe\left(CN{)}_6\right])$ shows properties of coordination compound.

When it gets dissolve they do not form simple ion like $F{e}^{+2}$ or $C{N}^{-},$ but instead their complex ions remain intact. whereas carnallite $(i.e.KMgC{l}_3),$ Gypsum $(i.e.CaS{O}_4)$ and Ferrous ammonium sulphate $(i.e.(N{H}_4{)}_{2}Fe\left(S{O}_4{)}_2\right)$ they dissolve and give simple ions.