The solution of $BiCl_{3}$ in dil. $HCl$ when diluted with water,forms a white precipitate which is:

$A$ solution prepared in conc. $HCl$ sometimes gives white turbidity even in the absence of $1^{st}$ group,when water is added to it. It is due to the presence of

$A$ light greenish coloured salt was soluble in water. On passing $H_2S$ into the solution,a black precipitate was obtained which dissolved readily in $HCl$. The metal ion present is:

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

Statement-$1$: Few drops of $HNO_3$ are added before proceeding to $III^{rd}$ group.
Statement-$2$: For the oxidation of $Fe^{+2} \rightarrow Fe^{+3}$.

The group reagent for the precipitation of group $II$ basic radicals in qualitative analysis is: