Among the following, which radicals can be precipitated by reagent $\mathrm{NH}_{4} \mathrm{Cl}$ and

Question

Among the following, which radicals can be precipitated by reagent $\mathrm{NH}_{4} \mathrm{Cl}$ and aq. $\mathrm{NH}_{3}$ ? $\mathrm{Ca}^{2+}, \mathrm{Al}^{3+}, \mathrm{Mg}^{2+}$\

Professor PC Thomas Classes · Answer

(c) : $\mathrm{Al}^{3+}$ is a group III basic radical which gets precipitates as $\mathrm{Al}(\mathrm{OH})_{3}$ with $\mathrm{NH}_{4} \mathrm{Cl}+\mathrm{NH}_{4} \mathrm{OH}$ (aq. $\mathrm{NH}_{3}$ ).