A4 KOH, O₂ → 2B +2H₂O (Green)
3B 4HCl → 2C+MnO₂ +2 H₂O (Purple)
2C H₂O, KI , 2 A + 2 KOH + D
In the above sequence of reactions, A and D, respectively, are :
1. KI and KMnO₄
2. KIO₃ and MnO₂
3. KI and KMnO₄
4. MnO, and KIO₃