An aqueous solution of a mixture of two inorganic saits, when treated with dilute HCl. gave a precipilate (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 precipitate (R) with 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 coloured solution S contains

An aqueous solution of a mixture of two inorganic saits, when treated

1.	An aqueous solution of a mixture of two inorganic saits, when treated with dilute HCl. gave a precipilate (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 precipitate (R) with 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 coloured solution S contains
Answer» `Fe_(2)(SO_(4))_(3)` `CuSO_(4)` `ZnSO_(4)` ` Na^(2)CrO_(4)` Solution :`CrCl_(3)+H_(2)S+"dil." HCl rarr` NO ppt. `CrCl_(3)+H_(2)S+NH_(4)OH rarr underset("GREEN (R)")(Cr(OH)_(3)(s))` `underset("which causes ppt. ion")underset(S^(2-)" ion CONC. increases")([(H_(2)S hArr 2H^(+)+S^(2-)),(NH_(4)OH hArr NH_(4)^(+)+OH),(2H^(+)+ overset()(O)H hArr H_(2)O)])` `Cr(OH)_(3)(s)+underset("OXIDISING AGENT") overset(NaOH+H_(2)O_(2))(rarr)Na_(2)CrO_(4)` Yellow solution (R)