Which ions can be separated using concentrated $NaOH$?

$A$ precipitate of ....... would be obtained on adding $HCl$ to a solution of $(Sb_2S_3)$ in yellow ammonium sulphide.

Among $Fe^{3+}$,$Pb^{2+}$,$Cu^{2+}$,and $Mn^{2+}$,identify the one that gets precipitated out while passing $H_2S$ gas in the presence of $NH_4OH$ as a group reagent. The highest possible oxidation state of the corresponding metal is:

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

Identify the metal $M$ and the precipitate $Z$ in the following reaction sequence:
$MSO_4$ $\xrightarrow{NH_4OH} \downarrow X \text{ (white)}$ $\xrightarrow{NH_4OH \text{ (excess)}} Y$ $\xrightarrow{H_2S} \downarrow Z$

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