Pyrolusite is \( \mathrm{MnO}_{2} \) used to prepare \( \mathrm{KMn...

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Pyrolusite is \( \mathrm{MnO}_{2} \) used to prepare \( \mathrm{KMnO}_{4} \). Steps are:
\[
\mathrm{MnO}_{2} \stackrel{\mathrm{I}}{\longrightarrow} \mathrm{MnO}_{4}^{2-} \stackrel{\mathrm{I}}{\longrightarrow} \mathrm{MnO}_{4}^{-}
\]
P
Steps I and II are respectively :
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(A) fuse with \( \mathrm{KOH} / \) air, electrolytic oxidation
(B) fuse with \( \mathrm{KOH} / \mathrm{KNO}_{3} \), electrolytic oxidation
(C) fuse with concentrated \( \mathrm{HNO}_{3} / \) air, electrolytic reduction
(D) dissolve in \( \mathrm{H}_{2} \mathrm{O} \), oxidation
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