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 compound (B). On heating compound (C ) with conc. `H_(2)SO_(4)` and NaCl, chlorine gas is liberate and a compound (D) of manganese alongwith other products is formed. Identify compounds A to D and also explain the reaction involved.

Explanation

The avilable information suggests that the violet compound (A) of manganese is `KMnO_(4)`. The various chemical reactions involved are listed as follows :
`underset((A))(2KMnO_(4)) overset(heat) to underset((B))(K_(2)MnO_(4))+ underset((C))(MnO_(2))+O_(2)`
`underset((C))(2MnO_(2))+4KOH+ underset(("From" KNO_(3)))(O_(2)) overset(heat) to underset((B))(2K_(2)MnO_(4))+2H_(2)O`
`MnO_(2)+4NaCl+4H_(2)SO_(4) overset(heat) to underset((D))(MnCl_(2))+4NaHSO_(4)+2H_(2)O+Cl_(2)`