A violet compound of manganese 'A’ decomposes on heating to liberate oxygen

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dandf-blockelements

#1

A violet compound of manganese '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 potassium nitrate to give a compound B. On heating compound C with cone. $H_{2}SO_{4}$ and NaCl, chlorine gas is liberated and compound D of manganese along with other products is formed. Identify compounds A to D and also explain the reactions involved.


#2

Since, compound C on treating with cone. $H_{2}SO_{4}$ and NaCl gives $Cl_{2}$ gas, so it is manganese dioxide ($MnO_{2}$). It is obtained along with Mn04_ when $KMnO_{4}$ (violet) is heated.
Thus,