Which of the following compounds is not soluble in hot dilute $HNO_3$?

How do we differentiate between $Fe^{3+}$ and $Cr^{3+}$ in group $III$?

Identify the correct reactions and observations from the following:
$(1) \ NH_4^+ \xrightarrow[K_2HgI_4]{KOH} \text{ Brown ppt. (Nessler's reagent)}$
$(2) \ Ni^{2+} \xrightarrow{dmg/OH^-} \text{ Rosy red ppt.}$
$(3) \ FeCl_3(aq.) \xrightarrow{NH_4OH} \text{ Reddish brown ppt.}$
$(4) \ CuSO_4(aq.) \xrightarrow{\text{excess } NH_4OH} \text{ Deep blue solution}$

What color does lead acetate give with $H_2S$?

The reagents $NH_4Cl$ and aqueous $NH_3$ will precipitate which of the following ions?

Nessler's reagent is