When \( \mathrm{MnO}_{2} \) is fused with \( \mathrm{KOH} \) and \( \mathrm{KNO}_{3} \), a colou...

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When \( \mathrm{MnO}_{2} \) is fused with \( \mathrm{KOH} \) and \( \mathrm{KNO}_{3} \), a coloured compound is formed. Choose the right compound with the appropriate colour.
\( \mathrm{P} \)
(a) \( \mathrm{K}_{2} \mathrm{MnO}_{4} \), green
(b) \( \mathrm{KMnO}_{4} \), purple
(c) \( \mathrm{Mn}_{2} \mathrm{O}_{3} \), brown
(d) \( \mathrm{Mn}_{3} \mathrm{O}_{4} \), black
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