Which sulphide is soluble in $(NH_4)_2CO_3$?

Which of the following ions forms a colored carbonate precipitate?

Which of the following can be used instead of $NH_4Cl$ in the analysis of group $III$ radicals?

$A$ black sulphide is formed by the action of $H_2S$ on

An aqueous solution contains the ions as $Hg_2^{2+}$,$Hg^{2+}$,$Pb^{2+}$,and $Cd^{2+}$. The addition of dilute $HCl$ $(6 \ N)$ precipitates:

$A$ $0.3 \, M$ $HCl$ solution contains the following ions: $Hg^{2+}, Cd^{2+}, Sr^{2+}, Fe^{2+}, Cu^{2+}$. The addition of $H_2S$ to the above solution will precipitate which of the following?