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Crystal Field Split in Octahedral Complexes

State True or...

Question

State True or False.
Both $C u^{2 +}$ and $C d^{2 +}$ ions react with KCN to form complex.

A

True

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B

False

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Solution

The correct option is A True
Both $C u^{2 +}$ and $C d^{2 +}$ ions react with KCN to form complex.
$C u^{2 +} + 2 C N^{-} ⟶ C u (C N)_{2}$
$C u (C N)_{2} ⟶ 2 C u C N ↓ + (C N)_{2}$
$C u C N + 3 K C N \to K_{3} C u (C N)_{4}] s t a b l e$
$C d^{2 +} + K C N ⟶ K_{2} [C d (C N)_{4}] u n s t a b l e$
The complex of copper is stable but the complex of cadmium is unstable.

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Similar questions

State whether the following statement is true or false:

C u^{2 +}

C d^{2 +}

both form soluble complex with

C N^{-}

but are decomposed by

H_{2} S

State True or False.

Mercury(II) ions react with KI to form orange precipitate of

H g I_{2}

which is soluble in excess of KI to form

K_{2} H g I_{4}

.

C u^{2 +}

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 +}

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

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. In the separation of

C u^{2 +}

C d^{2 +}

in 2nd group of qualitative analysis of eations, tetrammine copper(ll) sulphate and tetraammine cadmium(ll) sulphate react with

K C N

to form the corresponding cyanide complexes; which one of the following pairs of the complexes and their relative stabilities enables the separation of

C u^{2 +}

C d^{2 +}

?

Q. In the separation of

{C u}^{2 +}

{C d}^{2 +}

in 2nd group of qualitative analysis of cations tetrammine copper(II) sulphate and tetraammine cadmium(II) sulphate react with KCN to form the corresponding cyanide complexes, which one of the following pairs of the complexes and their relative stablities enables the separation of

{C u}^{2 +}

{C d}^{2 +}

?

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