KMnO4 can be prepared from K2MnO4 as per the reaction: 3 MnO4 2- + 2 H2O <=> 2 MnO4 - + MnO2 + 4 OH - The reaction can go to completion by removing OH - ions by adding

1. A. HCl
2. B. KOH
3. C. CO2
4. D. SO2

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