Pyrolusite ore on oxidation with `KCIO_(3)//KNO_(3)` in basic medium produces dark green coloured compound `(A)`, which on electrolysis produces a purple coloured compound `(B)`. The purple coloured rhombic prisms. It shows different reactions in different mediums.
Excess of compounds (B) on heating with conc. `H_(2)SO_(4)` gives an explosive oil (C ), which on heating decomposes to gives another compound (D ) along with oxygen.
Red coloured oxide (M) whose cation has pseudo inert electronic configuration reacts with compound (B) in acidic medium gives another oxide (N) which is black in colour. When sulphate of its metal is reacted with `K_(4)[Fe(CN)_(6)` it produces chocolate brown ppt. Select the correct statement.
A. The chocolate brown ppt formed is `Cu_(2)[Fe(CN)_(6)]`
B. the red coloured oxide is `Cu_(2)O`
C. the black coloured oxide is `CuO`
D. All of these
