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Potassium permanganate
Appears in
Concepts tested here
- Oxidation of hydrogen peroxide
- Preparation of potassium permanganate
All Questions
2014 AIPMT 1 question
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The reaction of aqueous $KMnO_4$ with $H_2O_2$ in acidic conditions gives:$KMnO_4$ is a strong oxidising agent and oxidises $H_2O_2$ to $O_2$; in acidic medium it is itself reduced to $Mn^{2+}$.
2013 NEET 1 question
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$KMnO_4$ can be prepared from $K_2MnO_4$ as per the reaction: $3MnO_4^{2-} + 2H_2O \rightleftharpoons 2MnO_4^- + MnO_2 + 4OH^-$. The reaction can go to completion by removing $OH^-$ ions by adding:$CO_2$ is acidic and removes $OH^-$ ions: $2OH^- + CO_2 \rightarrow CO_3^{2-} + H_2O$, which drives the reaction to completion.
HCl cannot be used because it is oxidised by $KMnO_4$, and $SO_2$ is a reducing agent.