Question

Which is a coordination compund ?

• 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. $\left[Fe\right(CN{)}_5]$ ) 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. $KMg{Cl}_3$ ), Gypsum (i.e. $Ca{SO}_4$) and Ferrous ammonium sulphate (i.e. $\left({NH}_4{)}_{2}Fe\right(S{O}_4{)}_2$ ) they dissovle and give simple ions.

Option C is correct.