Lead sulfate is soluble in which of the following?

Aqueous solution of $FeSO_4$ does not produce a precipitate with:

$A$ colorless aqueous solution contains nitrates of two metals,$X$ and $Y$. When it was added to an aqueous solution of $NaCl$,a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue $P$ and a solution $Q$. The residue $P$ was soluble in aqueous $NH_3$ and also in excess sodium thiosulfate. The hot solution $Q$ gave a yellow precipitate with $KI$. The metals $X$ and $Y$,respectively,are

Which of the following is not precipitated as sulphide by passing $H_2S$ in the presence of concentrated $HCl$?

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

Which of the following ions forms a white precipitate upon the addition of $HCl$ to its aqueous solution?