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

By passing H_(2)S in acidified KMnO_(4) solution we get

Why Zn(II) salt is not precipitated as Zn(OH)_(2) by ammonia solution in the presence of excess of ammonium

Partial precipitation of Mn^(2+) as Mn(OH)_(2) occurs with ammonia solution but the precipitate is soluble in ammonium salts. 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

White substance dissolves in hot water. A black precipitate appears on passing H_(2)S gas in its aqueous solution. The black precipitate dissolves in hot HNO_(3) . A white precipitate is obtained on adding concentrated H_(2)SO_(4) in its solution. This white precipitate is of

An orange red precipitate obtained by passing H_(2)S through an acidified solution of an inorganic salt indicates the presence of

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) H_(2)S in an ammoniacal medium. The precipitate (R) gave a coloured solution (S), when treated with H_(2)O_(2) in an aqueous NaOH medium. The precipitate P contains

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

Three separate samples of a solution of a single salt gave these results. One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. NaCl solution and one formed a black precipitate with H_(2)S . The salt could be