MCQ
Which is a coordination compund?
- AFerrous ammonium sulphate
- BCarnallite
- ✓Potassium ferrocyanide
- DGypsum
✓
Answer
Correct option: C.
Potassium ferrocyanide
Only 'Potassium ferrocyanide' $($i.e. $\left[\mathrm{Fe}(\mathrm{CN})_5\right])$ shows properties of coordination compound.
When it gets dissolve they do not form simple ion like $\mathrm{Fe}^{+2}$ or $\mathrm{CN}^{-},$ but instead their complex ions remain intact. whereas carnallite $($i.e. $\mathrm{KMgCl}_3),$ Gypsum $($i.e. $\mathrm{CaSO}_4)$ and Ferrous ammonium sulphate $($i.e. $\left.\left(\mathrm{NH}_4\right)_2 \mathrm{Fe}\left(\mathrm{SO}_4\right)_2\right)$ they dissovle and give simple ions.
When it gets dissolve they do not form simple ion like $\mathrm{Fe}^{+2}$ or $\mathrm{CN}^{-},$ but instead their complex ions remain intact. whereas carnallite $($i.e. $\mathrm{KMgCl}_3),$ Gypsum $($i.e. $\mathrm{CaSO}_4)$ and Ferrous ammonium sulphate $($i.e. $\left.\left(\mathrm{NH}_4\right)_2 \mathrm{Fe}\left(\mathrm{SO}_4\right)_2\right)$ they dissovle and give simple ions.
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