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$\mathrm{KMnO}_4$ oxidises $\mathrm{C}_2 \mathrm{H}_2 \mathrm{O}_4$ to form $\mathrm{CO}_2$. In which of the following, the reaction will be faster?
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Aq. HCl solution
The reaction will faster in aqueous $\mathrm{HCl}$ because chlorine ion present in $\mathrm{HCl}$ get oxidised into chlorine gas by $\mathrm{KMnO}_4$, so the amount of $\mathrm{KMnO}_4$ will be more as it oxidises both oxalic acid and chlorine ion when $\mathrm{HCl}$ is present.
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