Two salts A and B both give white ppt. with BaCI_(2), (insoluble in conc. HCI and conc. HNO_(3)) and brown ppt. with alkaline Nessler's reagent. Salt A gives blue colour with reagent X. Reagent X on oxidation gives reagent Y. The reagent Y gives blue colour with salt B. (X and Y are potassium contaning reagents.) What will be the oxidation state of the red-brown coloured residue obtain by thermal decomposition of salt B?

Two salts A and B both give white ppt. with BaCI_(2), (insoluble in co

1.	Two salts A and B both give white ppt. with BaCI_(2), (insoluble in conc. HCI and conc. HNO_(3)) and brown ppt. with alkaline Nessler's reagent. Salt A gives blue colour with reagent X. Reagent X on oxidation gives reagent Y. The reagent Y gives blue colour with salt B. (X and Y are potassium contaning reagents.) What will be the oxidation state of the red-brown coloured residue obtain by thermal decomposition of salt B?
Answer» `+2` `+3` `+6` `+1` SOLUTION :(a) `Fe_(2)(SO_(4))_(3).(NH_(4))_(2)SO_(4).24H_(2)O` (b) `FeSO_(4) (NH_(4))_(2)SO_(4)6H_(2)O` `underset(("White PPT"))(BaSO_(4))darr HgO underset(("Brown ppt"))(HG(NH_(2))Idarr)` `Fe^(3+)+K_(4) underset((x))([Fe(CN)_(6)])rarrFe_($)[Fe(CN)_(6)]_(3)` (Blue) `{:(Fe^(2+)+K_(3)[Fe(CN)_(6)]rarrFe_(3),[Fe(CN)_(6)]_(2)),(,""darr"Spontaneous"),(Fe^(3+)+[Fe(CN)_(6)]^(4-)overset(DELTA)larrFe_(4),underset(("Prussian Blue"))([Fe(CN)_(6)]_(3))):}`