Black solid underset(Delta)overset(KOH+Air)to underset(("green"))((A))overset(H_(2)SO_(4))to underset(("purple"))((B))+(C) (i) KI on reaction with alkali solution of (B) changes into a compound (D). (ii) The colour of the compound (B) disappears on treatment with the acidic solution of FeSO_(4) (iii) With cold conc. H_(2)SO_(4) compound (B) gives (E), which being explosive decomposes to yield (F) and oxygen. ltBrgt Q. Colour of the solution obtained, when ferrous sulphate reacts with acidic solution of (B):

Black solid underset(Delta)overset(KOH+Air)to underset(("green"))((A))

1.	Black solid underset(Delta)overset(KOH+Air)to underset(("green"))((A))overset(H_(2)SO_(4))to underset(("purple"))((B))+(C) (i) KI on reaction with alkali solution of (B) changes into a compound (D). (ii) The colour of the compound (B) disappears on treatment with the acidic solution of FeSO_(4) (iii) With cold conc. H_(2)SO_(4) compound (B) gives (E), which being explosive decomposes to yield (F) and oxygen. ltBrgt Q. Colour of the solution obtained, when ferrous sulphate reacts with acidic solution of (B):
Answer» Colourless Pink Green Yellow Solution :`underset("Black solid")(2MnO_(2))+4KOH+O_(2) to underset("green (A)")(2K_(2)MnO_(4))+2H_(2)O` `3MnO_(4)^(2-)+4H^(+) to underset((B))(2MnO_(4)^(-)+underset("(C) purple")(MnO_(2))+2H_(2)O)` (i) `2KMnO_(4)+H_(2)O+KI to 2KOH +2MnO_(2)+underset((D))(KIO_(3))` (ii) `2KMnO_(4)+8H_(2)SO_(4)+10FeSO_(4) to 2MnSO_(4)+5Fe_(2)(SO_(4))_(3)+K_(2)SO_(4)+8H_(2)O` (iii) `2KMnO_(4)+H_(2)SO_(4) overset("cold")to underset((E))(Mn_(2)O_(7))+K_(2)SO_(4)+H_(2)O` `underset((E))(Mn_(2)O_(7)) to underset((F))(2MnO_(2))+(3)/(2)O_(2)` `6KMnO_(4)+10FeC_(2)O_(4)+24H_(2)SO_(4) to 6MnSO_(4) +underset(("yellow"))(5Fe_(2)(SO_(4))_(3))+20CO_(3)+3K_(2)SO_(4)+24H_(2)O` `3NaSCN+FeCl_(3) to underset("Blood red colouration")(Fe(SCN)_(3)darr)+3NaCl`