Coordination CompoundMediumBloom L3

Question

Aqueous solution of FeSO4 gives tests for both Fe2+ and SO42– but after addition of excess of KCN, solution ceases to give test for Fe2+. This is due to the formation of

Options

A.the double salt FeSO4.2KCN.6H2O
B.Fe (CN)3
C.the complex ion [Fe (CN)6]4–
D.the complex ion [Fe (CN)6]3–

Solution

Sol. FeSO4 + excess KCN → K4 [Fe (CN)6]

It forms K4[Fe (CN)6]

⇒ it does not give test of Fe+2

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