Question

Which of the following is 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’ $(i.e.K_2[Fe\left(CN{)}_6\right])$ shows properties of coordination compound.
When it gets dissolve they do not form simple ion like $F{e}^{+2}orC{N}^{-}$ , but instead their complex ions
remain intact. Whereas carnallite $(i.e.KMgC{l}_3{)}_1$ 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.