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प्रश्न
How do you prepare:
K2MnO4 from MnO2?
उत्तर
K2MnO4 can be prepared from pyrolusite (MnO2). The ore is fused with KOH in the presence of either atmospheric oxygen or an oxidising agent, such as KNO3 or KClO4, to give K2MnO4.
2 MnO2 + 4 KOH + O2 \[\to^\Delta\]2 K2MnO4 +2 H2O
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