Q31 / 160 · TS EAMCET 2019 (06 May Shift 1) · Chemistry

How many protons will be consumed when dichromate ion oxidises $\mathrm{Fe}^{2+}$ ions in aqueous acidic medium?

  • A
    $4$
  • B
    $6$
  • C
    $10$
  • Correct answer
    D
    $14$

Solution

When dichromate ion, oxidises $\mathrm{Fe}^{2+}$ ions in aqueous acidic medium to $\mathrm{Fe}^{3+}$, the following reaction takes place : $\mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}+6 \mathrm{Fe}^{2+} \rightarrow 6 \mathrm{Fe}^{3+}+2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O}$ Hence, 14 protons are consumed in the reaction and option (d) is the correct answer.

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

More Redox Reactions Questions