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Standard XII

Chemistry

Nomenclature of Coordination Compounds

When KCN is...

Question

When $K C N$ is added to $C u S O_{4}$ solution, there is formation of the stable water soluble complex. This complex is :

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

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

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

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K [C u {(C N)}_{3}]

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Solution

The correct option is A $K_{3} [C u {(C N)}_{4}]$
When $K C N$ is added to $C u S O_{4}$ solution, the following reaction occurs.
$4 K C N + C u S O_{4} \to K_{3} [C u {(C N)}_{4}]$
Hence, the complex formed is $K_{3} [C u {(C N)}_{4}]$ .

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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?

Q. When aqueous

K C N

is added to a solution of

C u S O_{4}

, a white precipitate soluble in excess of

K C N

is formed. No precipitate is formed when

H_{2} S

gas is bubbled through the solution at this point because stable

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

does not ionize to give

C u^{+}

.
If true enter 1, else enter 0.

{C d}^{2 +}

and

{C u}^{2 +}

are separated by complex formation using

K C N

in which

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

is more stable than

K_{4} [{C d (C N)}_{4}]

; on passing

H_{2} S

gas

C d S

is percipitated.

If the given statement is 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}]

C u S O_{4}

when reacts with

K C N

forms

C u C N

which is insoluble in water. It is soluble in excess of

K C N

, due to formation of the following complex:

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When KCN is added to CuSO4 solution, there is formation of the stable water soluble complex. This complex is :

The correct option is A K3[Cu(CN)4]When KCN is added to CuSO4 solution, the following reaction occurs.4KCN+CuSO4→K3[Cu(CN)4]Hence, the complex formed is K3[Cu(CN)4].

When $K C N$ is added to $C u S O_{4}$ solution, there is formation of the stable water soluble complex. This complex is :

The correct option is A $K_{3} [C u {(C N)}_{4}]$
When $K C N$ is added to $C u S O_{4}$ solution, the following reaction occurs.
$4 K C N + C u S O_{4} \to K_{3} [C u {(C N)}_{4}]$
Hence, the complex formed is $K_{3} [C u {(C N)}_{4}]$ .