Pyrolustie on heating with KOH in the presence of air gives dark green compound (A).The solution of (A) on treatment with H_(2)SO_(4) gives a purple colouredcompound (B) which gives the following reactions : (i) Alkaline solution of B on reaction with KI changes it into compound (C ). (ii) The color of the compound (B) disappears on treatment with acidic soluiont of FeSO_(4). (iii) On reactionwith conc. H_(2)SO_(4) compound (B) gives another compound (D) which can decompose to produce compound (E ) along with oxygen gas. Identify compounds (A) to (E )and write balanced chemical equation involvedin eachcase.

Pyrolustie on heating with KOH in the presence of air gives dark green

1.	Pyrolustie on heating with KOH in the presence of air gives dark green compound (A).The solution of (A) on treatment with H_(2)SO_(4) gives a purple colouredcompound (B) which gives the following reactions : (i) Alkaline solution of B on reaction with KI changes it into compound (C ). (ii) The color of the compound (B) disappears on treatment with acidic soluiont of FeSO_(4). (iii) On reactionwith conc. H_(2)SO_(4) compound (B) gives another compound (D) which can decompose to produce compound (E ) along with oxygen gas. Identify compounds (A) to (E )and write balanced chemical equation involvedin eachcase.
Answer» Solution :Chemical equation for the formation of A `:` ` underset("Pyrolusite")(2MnO_(2)) + 4KOH + O_(2) rarr underset("Potassium manganate ") underset((A))(2K_(2)MnO_(4)) +2H_(2)O` Chemical equation for theformation of B form A `:` `3K_(2)MnO_(4) + 2H_(2)SO_(4) rarr underset("POTASSIUMPERMANGANATE ")underset((B))(2KMnO_(4))+ MnO_(2) + 2K_(2)SO_(4) + 2H_(2)O` Chemical equationsof reaction of COMPOUND B `:` (i)` 2KMnO_(4) + H_(2)O+ KI rarr 2MnO_(2) + 2KOH + underset("Potassium iodate")underset((C ))(KIO_(3))` (ii) `2KMnO_(4)+ 10 FeSO_(4) + 8 H_(2)SO_(4) rarr K_(2)SO_(4) + 2MnSO_(4)+ 5Fe_(2)(SO_(4))_(3) + 8 H_(2)O` `2Mn_(2)O_(7) rarr underset((E )) (4 MnO_(2)) + 3O_(2)`