Question:
In the separation of $Cu^{2+}$ and $Cd^{2+}$ of Ilnd group in qualitative analysis of cations, tetrammine copper (II) sulphate and tetrammine cadmium (II) sulphate react with KCN to form the corresponding cyano complexes, which one of the following pairs of the complexes and their relative stability enables the separation of $Cu^{2+} $ and $Cd^{2+}$?
In the separation of $Cu^{2+}$ and $Cd^{2+}$ of Ilnd group in qualitative analysis of cations, tetrammine copper (II) sulphate and tetrammine cadmium (II) sulphate react with KCN to form the corresponding cyano complexes, which one of the following pairs of the complexes and their relative stability enables the separation of $Cu^{2+} $ and $Cd^{2+}$?
Updated On: Jul 13, 2024
- $K_3[Cu(CN)_4] $: less stable and $K_2[Cd(CN)_4] $: more stable
- $K_3[Cu(CN)_4] $: more stable and $K_2[Cd(CN)_4] $: less stable
- $K_2[Cu(CN)_4] $: less stable and $K_2[Cd(CN)_4] $: more stable
- $K_2[Cu(CN)_4] $: more stable and $K_2[Cd(CN)_4] $: less stable
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The Correct Option is B
Solution and Explanation
$K_3 (Cu(CN)_4)$ is more stable while in $K_2 [Cd(CN)_4)$ is less stable.
Here, Cu in + 1 oxidation state.
Here, Cu in + 1 oxidation state.
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.