Question

Aqueous solution contains ${Zn\left({CH}_{3}COO\right)}_2$, ${Cd\left({CH}_{3}COO\right)}_2$ and ${Cu\left({CH}_{3}COO\right)}_2$. On passing gas, there is precipitation of ______ as sulphide

• A. ${Zn}^{2+},{Cd}^{2+}$
• B. ${Cu}^{2+},{Cd}^{2+}$
• C. ${Zn}^{2+},{Cu}^{2+}$
• D. ${Zn}^{2+},{Cu}^{2+}{Cd}^{2+}$

Answer 1

The correct option is D ${Zn}^{2+},{Cu}^{2+}{Cd}^{2+}$

Aqueous solution contains ${Zn\left({CH}_{3}COO\right)}_2$, ${Cd\left({CH}_{3}COO\right)}_2$ and ${Cu\left({CH}_{3}COO\right)}_2$. On passing gas, there is precipitation of ${Zn}^{2+},{Cu}^{2+}{Cd}^{2+}$ as sulphide.
In acetic acid, the sulphides of ${Zn}^{2+},{Cu}^{2+}{Cd}^{2+}$ are insoluble and precipitate.