In the oxidation of oxalic acid by KMnO_4,the | vedclass

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(A) The reaction between $KMnO_4$ and oxalic acid is given by: $2MnO_4^- + 5C_2O_4^{2-} + 16H^+ \rightarrow 2Mn^{2+} + 10CO_2 + 8H_2O$. In this reacti

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Auto catalysis

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(A) The reaction between $KMnO_4$ and oxalic acid is given by: $2MnO_4^- + 5C_2O_4^{2-} + 16H^+ \rightarrow 2Mn^{2+} + 10CO_2 + 8H_2O$. In this reaction,$Mn^{2+}$ ions are produced as a product. These $Mn^{2+}$ ions act as an auto-catalyst for the reaction. Initially,the concentration of $Mn^{2+}$ is very low,so the reaction proceeds slowly. As the reaction progresses,the concentration of $Mn^{2+}$ increases,which accelerates the rate of the reaction. This phenomenon,where a product of the reaction acts as a catalyst,is known as auto-catalysis.

List-$I$ (Process)	List-$II$ (Catalyst)
$a$. Deacon's process	$i$. $ZSM-5$
$b$. Contact process	$ii$. $CuCl_2$
$c$. Cracking of hydrocarbons	$iii$. $Ni$
$d$. Hydrogenation of vegetable oils	$iv$. $V_2O_5$

In the oxidation of oxalic acid by $KMnO_4$,the color of $KMnO_4$ disappears slowly at the start of the reaction but disappears very fast afterwards. This is an example of:

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