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Displacement Reaction

Copper sulpha...

Question

Copper sulphate dissolved in excess of $K C N$ to give:-

C u C N

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

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

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C u (C N)_{2}

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Solution

The correct option is B $[C u (C N)_{4}]^{3}$
When copper sulphate dissolves in potassium cyanide, then following reaction takes place:-

$C u S O_{4} + 2 K C N ⟶ K_{2} S O_{4} + C u (C N)_{2}$

Now, since $C u (C N)_{2}$ is unstable, it undergoes decomposition as:-

$C u (C N)_{2} ⟶ C u C N + (C N)_{2}$

Now, $C u C N + 3 K C N ⟶ K_{3} [C u (C N)_{4}]$

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

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Similar questions

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

C u S O_{4}

K F

H F

K H F_{2}

K^{+}, F^{-}

H^{+}

K^{+}, F

H F

K^{+}

[H F_{2}]^{-}

[K H F]^{+}

F^{-}

K C N

C u (C N)_{2}

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

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

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

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

H_{2} S

C u S O_{4} .5 H_{2} O \to C u S O_{4} + 5 H_{2} O

C u S O_{4} + 2 K C N \to C u (C N)_{2} + K_{2} S O_{4}

2 C u (C N)_{2} \to 2 C u C N + (C N)_{2}

2 C u C N + 6 K C N \to 2 K_{3} [C u (C N)_{4}]

(Molar mass of K = 39 g / m o l, C u = 63.5 g / m o l)

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