In the separation of $$C{{u}^{2+}}$$ and $$C{{d}^{2+}}$$ in 2nd group 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 enable the separation of $$C{{u}^{2+}}$$ and $$C{{d}^{2+?}}$$

Question

TuteeHUB · Accepted Answer

$${{K}_{2}}\left[ Cu{{\left( CN \right)}_{4}} \right]$$ less stable and $${{K}_{2}}[Cd{{(CN)}_{4}}]$$ more stable

TuteeHUB · Answer

$${{K}_{3}}\left[ Cu{{\left( CN \right)}_{4}} \right]$$ more stable and $${{K}_{2}}[Cd{{(CN)}_{4}}]$$ less stable

TuteeHUB · Answer

$${{K}_{2}}\left[ Cu{{\left( CN \right)}_{4}} \right]$$ more stable and $${{K}_{2}}[Cd{{(CN)}_{4}}]$$ less stable

TuteeHUB · Answer

$${{K}_{3}}\left[ Cu{{\left( CN \right)}_{4}} \right]$$less stable and $${{K}_{2}}[Cd{{(CN)}_{4}}]$$ more stable

1.	In the separation of \[C{{u}^{2+}}\] and \[C{{d}^{2+}}\] in 2nd group 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 enable the separation of \[C{{u}^{2+}}\] and \[C{{d}^{2+?}}\]
A.	\[{{K}_{3}}\left[ Cu{{\left( CN \right)}_{4}} \right]\] more stable and \[{{K}_{2}}[Cd{{(CN)}_{4}}]\] less stable
B.	\[{{K}_{2}}\left[ Cu{{\left( CN \right)}_{4}} \right]\] less stable and \[{{K}_{2}}[Cd{{(CN)}_{4}}]\] more stable
C.	\[{{K}_{2}}\left[ Cu{{\left( CN \right)}_{4}} \right]\] more stable and \[{{K}_{2}}[Cd{{(CN)}_{4}}]\] less stable
D.	\[{{K}_{3}}\left[ Cu{{\left( CN \right)}_{4}} \right]\]less stable and \[{{K}_{2}}[Cd{{(CN)}_{4}}]\] more stable
Answer» B. \[{{K}_{2}}\left[ Cu{{\left( CN \right)}_{4}} \right]\] less stable and \[{{K}_{2}}[Cd{{(CN)}_{4}}]\] more stable

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