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Standard XII

Chemistry

Copper II Sulphate

CuSO4 decolor...

Question

$C u S O_{4}$ decolorizes on addition of $K C N$ , the product is :

[C u (C N)_{4}]^{2 -}

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C u C N

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C u (C N)_{2}

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C u^{2 +}

get reduced to form

[C u (C N)_{4}]^{2 -}

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Solution

The correct option is A $C u C N$
Option (B) is correct.
$C u S O_{4}$ decolorizes on addition of $K C N$ ; the product is $C u C N$ .
$2 C u S O_{4} + 10 K C N ⟶ 2 K_{3} [C u (C N)_{4}] + 2 K_{2} S O_{4} + (C N)_{2}$
First, $C u (C N)_{2}$ is formed which decomposes to form $(C N)_{2}$ and $C u_{2} (C N)_{2}$ . $C u_{2} (C N)_{2}$ then combines with $K C N$ to form $K_{3} [C u (C N)_{4}]$ .

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Similar questions

C u S O_{4}

decolourises on addition of KCN, the product is

Which compound is formed when an excess of $K C N$ is added to an aqueous solution of copper sulphate?

Q. If

C u^{2 +}

and

C d^{2 +}

both are present, it is difficult to analyse. A scheme to analyse in a mixture is given below.
KCN forms complex with

C u^{2 +}

and

C d^{2 +}

C u^{2 +} + 2 C N^{-} ⟶ C u (C N)_{2}

C u (C N)_{2} ⟶ 2 C u C N ↓ + (C N)_{2}

C u C N + 3 K C N K_{3} C u (C N)_{4}] s t a b l e C d^{2 +} + K C N ⟶ K_{2} [C d (C N)_{4}] u n s t a b l e

when

H_{2} S

gas is passed, unstable complex of

C d^{2 +}

gives yellow ppt

[C d (C N)_{4}]^{2 -} ⇌ C d^{2 +} + 4 C N^{-}

C d^{2 +} + S^{2 -} ⟶ C d S y e l l o w ↓

If true enter 1, else enter 0.

Q. Select correct answer:

(I)

K F

combines with

H F

to form

K H F_{2}

. The compound contains the species:
(a)

K^{+}, F^{-}

and

H^{+}

(b)

K^{+}, F

and

H F

(c)

K^{+}

and

[H F_{2}]^{-}

(d)

[K H F]^{+}

and

F^{-}

(II) Which compound is formed when excess of

K C N

is added to aqueous solution of copper sulphate?
(a)

C u (C N)_{2}

(b)

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

(c)

K [C u (C N)_{2}]

(d)

K_{3} [C u (C N)_{4}]

Q. When

K C N

(excess) is added to a

C u^{2 +}

, final species formed is

[C u (C N)_{4}]^{3 -}

If true enter 1, else enter 0.

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CuSO4 decolorizes on addition of KCN, the product is :

The correct option is A CuCNOption (B) is correct.CuSO4 decolorizes on addition of KCN; the product is CuCN.2CuSO4+10KCN⟶2K3[Cu(CN)4]+2K2SO4+(CN)2First, Cu(CN)2 is formed which decomposes to form (CN)2 and Cu2(CN)2. Cu2(CN)2 then combines with KCN to form K3[Cu(CN)4].

$C u S O_{4}$ decolorizes on addition of $K C N$ , the product is :