A Violet Compound of Manganese (A) Decomposes
Que: A violet compound of manganese (A) decomposes on heating to liberate oxygen and compounds (B) and (C) of manganese is formed. Compound (C) reacts with KOH in the presence of KNO3 to give compound (B). On heating compound (C) with conc. H2SO4 and NaCl, Cl2 gas is liberated and compound (D) of manganese is formed. Identify A, B, C, D along with reactions involved.
Ans: A – KMnO4 B – K2MnO4 C – MnO2 D – MnCl2
KMnO4 → K2MnO4 + MnO2 + O2
(A) (B) (C)
MnO2 + KOH + KNO3 → 2 K2MnO4 + 2 H2O
MnO2 + 4 NaCl + 4 H2SO4 (conc.) → MnCl2 + 2 NaHSO4 + 2 H2O + Cl2