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If stoichiometric quantities of $\mathrm{KMnO}_4$ and $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ mixture is added for the oxidation of $\mathrm{Fe}^{2+}$ to $\mathrm{Fe}^{3+}$ in acidic medium, then $\mathrm{Fe}^{2+}$ will be oxidised
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more by $\mathrm{KMnO}_4$
$\mathrm{KMnO}_4+\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
In this process $\mathrm{KMnO}_4$ is strong oxidising agent in acidic medium. It oxidises $\mathrm{Fe}^{2+}$ to $\mathrm{Fe}^{3+} . \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is weak oxidising agent in acidic medium.
In this process $\mathrm{KMnO}_4$ is strong oxidising agent in acidic medium. It oxidises $\mathrm{Fe}^{2+}$ to $\mathrm{Fe}^{3+} . \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is weak oxidising agent in acidic medium.
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