An aqueous solution of FeSO_4 gives tests for | vedclass

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(C) When $KCN$ is added in excess to a solution containing $Fe^{2+}$ ions,the $Fe^{2+}$ ions react to form a stable coordination complex.The reaction

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the complex ion $[Fe(CN)_6]^{4-}$

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(C) When $KCN$ is added in excess to a solution containing $Fe^{2+}$ ions,the $Fe^{2+}$ ions react to form a stable coordination complex.The reaction is: $Fe^{2+} + 6CN^- \rightarrow [Fe(CN)_6]^{4-}$.Since the $Fe^{2+}$ ions are now part of the stable complex ion $[Fe(CN)_6]^{4-}$,they are no longer available as free ions in the solution to give the characteristic chemical tests for $Fe^{2+}$.

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:

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