Question

In the separation of $\mathrm{Cu}^{2+}$ and $\mathrm{Cd}^{2+}$ in $2^{	ext {nd }}$ group qualitative analysis of cations tetrammine copper (II) sulphate and tetrammine cadmium (II) sulphate react with $	ext{KCN}$ to form the corresponding cyano complexes. Which one of the following pairs of the complexes and their relative stability enables the separation of $\mathrm{Cu}^{2+}$ and $\mathrm{Cd}^{2+}?$

Accepted Answer

$\mathrm{K}_3\left[\mathrm{Cu}(\mathrm{CN})_4\right]$ more stable and $\mathrm{K}_2\left[\mathrm{Cd}(\mathrm{CN})_4\right]$ less stable

Answer

$\mathrm{K}_2\left[\mathrm{Cu}(\mathrm{CN})_4\right]$ less stable and $\mathrm{K}_2\left[\mathrm{Cd}(\mathrm{CN})_4\right]$ more stable

Answer

$\mathrm{K}_2\left[\mathrm{Cu}(\mathrm{CN})_4\right]$ more stable and $\mathrm{K}_2\left[\mathrm{Cd}(\mathrm{CN})_4\right]$ less stable

Answer

$\mathrm{K}_3\left[\mathrm{Cu}(\mathrm{CN})_4\right]$ less stable and $\mathrm{K}_2\left[\mathrm{Cd}(\mathrm{CN})_4\right]$ more stable

JEE CHEMISTRY MCQ: PRACTICAL CHEMISTRY

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