Transition and InnerTransition Elements - Result Question 161
####61. In dilute aqueous $H _2 SO _4$ the complex diaquadioxalatoferrate (II) is oxidised by $MnO _4^{-}$. For this reaction, the ratio of the rate of change of $\left[H^{+}\right]$to the rate of change of $\left[MnO _4^{-}\right]$is
(2015 Adv.)
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Answer:
Correct Answer: 61. (8)
Solution:
- The balanced redox reaction is
$MnO _4^{-}+\left[Fe\left(H _2 O\right) _2\left(C _2 O _4\right) _2\right]^{2-}+8 H^{+} \longrightarrow Mn^{2+}+Fe^{3+}$
$$ +4 CO _2+6 H _2 O $$
$\Rightarrow \quad \frac{r\left[H^{+}\right]}{r\left[MnO _4^{-}\right]}=\frac{8}{1}=8$
