Q10 / 160 · TS EAMCET 2018 (05 May Shift 2) · Chemistry

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

  • A
    equally by $\mathrm{KMnO}_4$ and $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
  • Correct answer
    B
    more by $\mathrm{KMnO}_4$
  • C
    more by $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
  • D
    no reaction

Solution

$\mathrm{KMnO}_4+\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ 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.

Hence, the correct answer is option: 'B'.

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