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Electrolysis and Electrolytes

Consider foll...

Question

Consider following experiment and answer the question:

(A) When $F e (C N)_{2}$ solution is treated with KCN solution, species formed, no longer, gives 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 $S O_{4}^{2 -}$ .

EAN of iron formed in (A) is_____

A

26

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B

24

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C

36

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D

38

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Solution

The correct option is D 36
Option (C) is correct.

(A) : When $F e (C N)_{2}$ solution is treated with $K C N$ solution, $K_{4} [F e (C N)_{6}]$ complex is formed. It dissociates to give $K^{+}$ ion and $[F e (C N)_{6}]^{2 -}$ ions and hence 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, $K_{2} S O_{4} . A l_{2} (S O_{4})_{3} \cdot 24 H_{2} O$ double salt is formed. It gives positive tests of $K^{+}, A l^{3 +}$ and $S O_{4}^{2 -}$ .

EAN of iron formed in (A), $K_{4} [F e (C N)_{6}]$ is $= 26 - 2 + 12 = 36$

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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______ .

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 A does not give test of

F e^{2 +}

C N^{-}

. It is due to 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 :

C u S O_{4}

is treated with excess KCN solution, what compound(s) is/are formed?

Q. Name the product formed when phenol is treated with acidified solution of

N a_{2} C r_{2} O_{7} .

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