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 an ammoniacal medical. The precipitate (R) gave a coloured solution (S), when treated with H_(2)O_(2) in an aqueous NaOH medium. Answer Question 62 and 63 The coloured solution (S) contains

An aqueous solution of a mixture of two inorganic salts when treated w

1.	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 an ammoniacal medical. The precipitate (R) gave a coloured solution (S), when treated with H_(2)O_(2) in an aqueous NaOH medium. Answer Question 62 and 63 The coloured solution (S) contains
Answer» `Fe(SO_(4))_(3)` `CuSO_(4)` `ZnSO_(4)` `Na_(2)CrO_(4)` Solution :The coloured solution (S) is `Na_(2)CrO_(4)` The AVAILABLE data suggests that the mixture contains `Pb^(2+)` and `Cr^(3+)` ions. The series of reactions involved are :