Passing H_(2)S gas in slightly acidic solution of a metal nitrate results in formation in formation of a black coloured precipitate (X). The precipitate is insoluble in cold-dilute acid solution as well as in ammonium sulphide solution. Boiling, concentrated HCl dissolves X, evolving a pungent smelling gas .Hot, dilute HNO_(3) dissolves the precipitate, leaving behind a white precipitate (Y). Boiling the solution for a longer time dissolves Y too. The most likely density of X and Y are

Passing H_(2)S gas in slightly acidic solution of a metal nitrate resu

1.	Passing H_(2)S gas in slightly acidic solution of a metal nitrate results in formation in formation of a black coloured precipitate (X). The precipitate is insoluble in cold-dilute acid solution as well as in ammonium sulphide solution. Boiling, concentrated HCl dissolves X, evolving a pungent smelling gas .Hot, dilute HNO_(3) dissolves the precipitate, leaving behind a white precipitate (Y). Boiling the solution for a longer time dissolves Y too. The most likely density of X and Y are
Answer» `CUS` and S `Bi_(2)S_(3)` and S `PbS` and S `Ag_(2)S` and S Answer :B