Q12 / 180 · COMEDK 2018 · Chemistry
An example for auto-catalysis is
- Aoxidation of $\mathrm{NO}$ to $\mathrm{NO}_{2}$
- Boxidation of $\mathrm{SO}_{2}$ to $\mathrm{SO}_{3}$
- Cdecomposition of $\mathrm{KClO}_{3}$ to $\mathrm{KCl}$ and $\mathrm{O}_{2}$
- Correct answerDoxidation of oxalic acid by acidified $\mathrm{KMnO}_{4}$
Solution
An example of auto-catalysis is oxidation of oxalic acid by acidified $\mathrm{KMnO}_{4}$ solution.
In this reaction, one of the product $\left(\mathrm{Mn}^{2+}\right)$ formed act as a catalyst and speed up the reaction.
$2 \mathrm{MnO}_{4}^{-}+6 \mathrm{H}^{+}+5 \mathrm{C}_{2} \mathrm{H}_{2} \mathrm{O}_{4}$
Permagnate ion Oxalic acid
$$
\longrightarrow 2 \mathrm{Mn}^{2+}+8 \mathrm{H}_{2} \mathrm{O}+10 \mathrm{CO}_{2}
$$
where $\mathrm{Mn}^{2+}+8$ is the Auto-catalyst
Hence, the correct answer is option: 'D'.