An aqueous solution of $FeSO_4$ gives tests for both $Fe^{2+}$ and $SO_4^{2-}$ ions,but after the addition of an excess of $KCN$,the solution ceases to give a test for $Fe^{2+}$. This is due to the formation of:
- Athe double salt $FeSO_4 \cdot 2KCN \cdot 6H_2O$
- B$Fe(CN)_3$
- Cthe complex ion $[Fe(CN)_6]^{4-}$
- Dthe complex ion $[Fe(CN)_6]^{3-}$
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