A violet compound of manganes (A) decomposes on heating to liberate oxygen and compounds (B) and (C) of manganese are 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 alongwith reactions involved.
