A white crystalline substance dissolves in water.On passing H_(2)S in this solution, a black precipitate is obtained.The black precipitate dissolves completely in hot HNO_(3).On adding a few drops of concentrated H_(2)SO_(4), a white precipitate is obtained which is soluble in ammonium acetate.The white precipitate is that of ,

A white crystalline substance dissolves in water.On passing H_(2)S in

1.	A white crystalline substance dissolves in water.On passing H_(2)S in this solution, a black precipitate is obtained.The black precipitate dissolves completely in hot HNO_(3).On adding a few drops of concentrated H_(2)SO_(4), a white precipitate is obtained which is soluble in ammonium acetate.The white precipitate is that of ,
Answer» `BaSO_(4)` `SrSO_(4)` `PbSO_(4)` `Ag_(2)SO_(4)` Solution :The WHITE precipitate obtained with `H_(2)SO_(4)` is that of `PbSO_(4)`.The white CRYSTALLINE substance MAY be that of `Pb(NO_(3))_(2)`. `Pb^(2+)+S^(2+)to PbS darr ("black"),3PbS darr+8HNO_(3) to 3Pb^(2+)+6NO_(3)^(-) + 3S darr+2NO+4H_(2)O` `Pb^(2+) +SO_(4)^(2-) to PbSO_(4) darr` (white) `PbSO_(4)+2CH_(3)COONH_(4) to (CH_(3)COO)_(2)Pb+(NH_(4))_(2)SO_(4)` `BaS` and `SrS` precipitates are not black in colour.`Ag_(2)SO_(4)` is white precipitate but does not DISSOLVE in ammonium acetate.