Comprehension Pyrolusite ore on oxidation with \( \mathrm{KClO}_{3} / \mathrm{KNO}_{3} \) in bas...

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Comprehension
Pyrolusite ore on oxidation with \( \mathrm{KClO}_{3} / \mathrm{KNO}_{3} \) in basic medium produces dark green coloured compound (A), which on electrolysis produces a purple coloured compound (B). The purple coloured compound can be crystallised to deep purple rhombic prisms. It shows different reactions in different mediums. Excess of compound (B) on heating with concentrated \( \mathrm{H}_{2} \mathrm{SO}_{4} \) gives an explosive oil (C), which on heating decomposes to gives another compound (D) along with oxygen.
Identify (D)
(a) \( \mathrm{Mn}_{2} \mathrm{O}_{7} \)
(b) \( \mathrm{MnO}_{2} \)
(c) \( \mathrm{MnSO}_{4} \)
(d) \( \mathrm{Mn}_{2} \mathrm{O}_{3} \)
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