Which of the following sulphates is insoluble in water?

In the group $III$ radicals,in place of $NH_4Cl$,which of the following can be used?

Match List-$I$ with List-$II$ :

List-$I$ (Metal Ion)	List-$II$ (Group in Qualitative analysis)
$(a)$ $Mn^{2+}$	$(i)$ Group-$III$
$(b)$ $As^{3+}$	$(ii)$ Group-$IIA$
$(c)$ $Cu^{2+}$	$(iii)$ Group-$IV$
$(d)$ $Al^{3+}$	$(iv)$ Group-$IIB$

Choose the most appropriate answer from the options given below :

Which compound gives a black color with $NH_4OH$?

Addition of sodium thiosulphate solution to a solution of silver nitrate gives $X$ as a white precipitate, which is insoluble in water but soluble in excess thiosulphate solution to give $Y$. On boiling in water, $Y$ gives $Z$. $X$, $Y$, and $Z$ respectively are:

The $V^{-}A$ group precipitate was dissolved in $HNO_3$ and treated with an excess of $NH_4OH$. It gives a white precipitate because of: