Question

Which of the following can be used in place of ammonium chloride to test third group radicals?

• A. Ammonium nitrate
• B. Ammonium sulphate
• C. Ammonium sulphide
• D. None of the above

Answer 1

Answer: (C)

Ammonium sulphide

If we use ${NH}_4{NO}_3$ or ${\left({NH}_4\right)}_2{SO}_4$ in place of ${NH}_{4}Cl$, then the aqueous solution will contain ${Cl}^{-}$ and ${{SO}_4}^{2-}$/${{NO}_3}^{-}$ ions which will form ionic salts with III group metals which undergoes ionisation immediately after the formation without precipitation as their solubility product is very high. This is not the case with ammonium sulphide.

Hence, $C$ is the answer.