An aqueous solution containing ferrous cyanide and potassium cyanide in the mo

Discussion Forum : Coordination Compounds

Question -

An aqueous solution containing ferrous cyanide and potassium cyanide in the molar ratio of 1 : 4 is evaporated. The solid obtained is re-dissolved in water. The ion present in this solution is

Options:

A .

[F e (C N)_{6}]^{4 -}

B .

[F e (C N)_{6}]^{3 -}

C .

[F e (C N)_{3}]

D .

F e^{3 +}

Answer: Option A
:
A
The solid obtained is

F e S O_{4} + K C N \to K_{4} [F e (C N)_{6}] \Rightarrow 4 K^{+} + [F e (C N)_{6}]^{4 -}

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