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Coordination Complexes

A When FeCN...

Question

(A) When $F e (C N)_{2}$ solution is treated with KCN solution, species formed does not give tests of $F e^{2 +}$ and $C N^{-}$ .

(B) When $K_{2} S O_{4}$ solution is treated with $A l_{2} (S O_{4})_{3}$ solution, species formed gives tests of $K^{+}, A l^{3 +}$ and $S O_{4}^{2 -}$ .

Species formed in experiment A does not give test of $F e^{2 +}$ and $C N^{-}$ . It is due to formation of________ .

A

K_{2} [F e (C N)_{4}]

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B

K_{3} [F e (C N)_{5}]

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C

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

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D

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

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Solution

The correct option is D $K_{4} [F e (C N)_{6}]$
Option (D) is correct.

(A) : $F e (C N)_{2} + 4 K C N ⟶ K_{4} [F e (C N)_{6}]$ .

Ferrous cyanide forms a coordinated complex so it does not give $F e^{2 +}$ and $C N^{-}$ test but dissociates to give $K^{+}$ and $[F e (C N)_{6}^{2 +}$

(B) : $K_{2} S O_{4} + A l_{2} (S O_{4})_{3} + 24 H_{2} O ⟶ K_{2} S O_{4} . A l_{2} (S O_{4})_{3} \cdot 24 H_{2} O$

It is a double salt and undergoes dissociation, thus gives tests of $K^{+}, A l^{3 +}$ and $S O_{4}^{2 -}$

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Similar questions

Consider the following experiment and answer the question :

F e (C N)_{2}

solution is treated with KCN solution, species formed does not give tests of

F e^{2 +}

C N^{-}

K_{2} S O_{4}

solution is treated with

A l_{2} (S O_{4})_{3}

solution, species formed gives tests of

K^{+}, A l^{3 +}

S O_{4}^{2 -}

.

Species formed in experiment (B) is______ .

Consider following experiment and answer the question:

F e (C N)_{2}

solution is treated with KCN solution, species formed, no longer, gives tests of

F e^{2 +}

C N^{-}

K_{2} S O_{4}

solution is treated with

A l_{2} (S O_{4})_{3}

solution, species formed gives tests of

K^{+}, A l^{3 +}

S O_{4}^{2 -}

.

EAN of iron formed in (A) is_____

Q. Species formed in experiment

A

does not give test of

C u^{2 +}

. It is due to the formation of:

Q. Aqueous solution of

F e S O_{4}

gives tests for both

F e^{2 +}

S O_{4}^{2 -}

but after addition of excess of KCN, solution ceases to give test for

F e^{2 +}

. This is due to the formation of :

Q. Light green solution of (A) does not give blue coloured ppt with

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

but on adding a drop of

{H N O}_{3}

, blue ppt. of (B) appears. However, (A) gives blue colour (C) with

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

. Identify (A) if it, also gives white ppt with

A g {N O}_{3}

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