What happens to sulphide ion concentration when HCl is added to `H_(2)S` solution?

The sulphide ion concentration [S^(2-)] in saturated H_(2)S solution is 1xx10^(-22) . Which of the following sulphides should be quantitavely precipitated by H_(2)S in the presence of dil. HCl ? {:("Sulphide",,"Solubility Product"),((I),,1.4xx10^(16)),((II),,1.2xx10^(-22)),((III),,8.2xx10^(-46)),((IV),,5.0xx10^(-34)):}

What happens when silver nitrate solution is aded to Na_(2)S_(2)O_(3) solution and then content is allowed to keep for a longer period?

What happen when silver nitrate solution is added to Na_(2)S_(2)O_(3) solution and then content is allowed to keep for a longer period?

A precipitate of the following would be obtained when HCl is added to a solution of stannous sulphide (SnS) in yellow ammonium sulphide