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KMnO4 can be prepared from K2MnO4 as per the reaction: 3MnO4^2− + 2H2O → 2MnO4^− + MnO2 + 4OH^−. The reaction can go to completion by removing OH^− ions by adding:
- KOH
- CO2
- SO2
- HCl
Correct answer: CO2
Solution
The reaction can be driven to completion by removing OH⁻ ions. CO₂ reacts with OH⁻ to form HCO₃⁻ or CO₃²⁻, thus reducing the concentration of OH⁻ and shifting the equilibrium forward.
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