ZnS is not precipitated by passing `H_(2)S` in acidic medium but CuS is precipitated . The reason for it is

The correct option(s) to distinguish nitrate salts of Mn^(2+) and Cu^(2+) taken separately is (Are) (1) Mn^(2+) shows the characteristic green colour in the flame test (2) only Cu^(2+) shows the the formation of precipitate by passing H_(2)S in acidic medium (3) only Mn^(2+) shows the formation of precipitate by passing H_(2)S in faintly basic medium (4) Cu^(2+)|"Cu has higher reduction potential then "Mn^(2+)|Mn (measured under similar conditions)

Cus is not precipitated by passing H_(2)S through copper sulphate solution containing KCN. Give reason

Cus is not precipitated by passing H_(2)S through copper sulphate solution containing KCN. Give reason

Zn^(2+) are precipitated by passing H_(2)S in ammoniacal solution. But they are not prepitated from acidic solution .Explain.

A solution containing a group-IV cation gives a precipitate on passing, H_(2)S . A solution of this precipitate in dil. HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is :

An aqueous solution of a mixture of two inorganic salts when treated with dilute HCl, gave a precipitate (P) and a filtrate (Q). The precipitate (P) was found to dissolve in hot water. The filtrate (Q) remained unchanged, when treated with H_(2)S in a dilute mineral acid medium. However, it gave a green precipitate (R) in with H_(2)S in ammoniacal medium. The precipitate (R) gave a coloured solution (S), when treated with H_(2)O_(2) in an aqueous NaOH medium. The coloured solution (S) contains