Transition and InnerTransition Elements - Result Question 61
61. In dilute aqueous $\mathrm{H}_2 \mathrm{SO}_4$ the complex diaquadioxalatoferrate (II) is oxidised by $\mathrm{MnO}_4^{-}$. For this reaction, the ratio of the rate of change of $\left[\mathrm{H}^{+}\right]$to the rate of change of $\left[\mathrm{MnO}_4^{-}\right]$is
(2015 Adv.)
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Answer:
Correct Answer: 61. (8)
Solution: The balanced redox reaction is $$ \begin{aligned} \mathrm{MnO}_4^{-}+\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_2\left(\mathrm{C}_2 \mathrm{O}_4\right)_2\right]^{2-}+8 \mathrm{H}^{+} \longrightarrow & \mathrm{Mn}^{2+}+\mathrm{Fe}^{3+} \\ & +4 \mathrm{CO}_2+6 \mathrm{H}_2 \mathrm{O} \end{aligned} $$
$\Rightarrow \quad \dfrac{r\left[\mathrm{H}^{+}\right]}{r\left[\mathrm{MnO}_4^{-}\right]}=\dfrac{8}{1}=8$
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