$Fe^{3+}$ cation gives a Prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of:
- A$[Fe(H_2O)_6]_2[Fe(CN)_6]$
- B$Fe_2[Fe(CN)_6]_2$
- C$Fe_3[Fe(OH)_2(CN)_4]_2$
- D$Fe_4[Fe(CN)_6]_3$
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