Which of the following sulphides is yellow in colour?

The ion that can be precipitated by $HCl$ as well as $H_2S$ is

$A$ $0.3 \, M$ $HCl$ 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?

Aqueous solution of Mohr's salt gives the test of which ions?

$A$ precipitate of which of the following is obtained when $HCl$ is added to a solution of stannous sulphide $(SnS)$ in yellow ammonium sulphide?

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$Fe(OH)_3 \downarrow + NaOH(\text{excess}) \longrightarrow \text{No reaction}$