Which of the following ions forms a colored carbonate precipitate?

Which of the following sulfides is completely precipitated upon dilution of its acidic solution?

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

$Al^{3+}$,$Fe^{3+}$,$Zn^{2+}$,and $Ni^{2+}$ ions are present in an acidic solution. Excess of ammonium chloride $(NH_4Cl)$ solution is added followed by the addition of ammonium hydroxide $(NH_4OH)$ solution. The resulting precipitate will contain:

Which reagent is used to distinguish between silver and lead salts?

In the group analysis of cations,$Ba^{2+}$ and $Ca^{2+}$ are precipitated respectively as