To have more sulphide ion concentraion `H_(2)S` should be passed through

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H_(2)S (g) is passed through this solution?

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H_(2)S (g) is passed through this solution?

What is the coordination entity formed when excess of aqueous KCN is added to aqueous solution of CuSO_(4) ? Why is it that no precipitate of copper sulphide is obtained when H_(2)S(g) is passed through this solution ?

The metallic sulphide not precipitated if H_2S gas is passed through HCl containing aqueous solution is:

Why zinc sulphide is not precipitated when H_(2)S is passed through ZnCl_(2) solution ?

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

In quantitative analysis which of the following groups of metal ions are precipitated as insoluble sulphides when H_(2)S(g) is passed through an ammonical solution of the salt mixture?

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)):}