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  4. The dark purple colour of KMnO 4 disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is :

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Q. The dark purple colour of $KMnO _4$ disappears in the titration with oxalic acid in acidic medium.
The overall change in the oxidation number of manganese in the reaction is :

JEE MainJEE Main 2022Redox Reactions

Solution:

In acidic medium,
$\overset{+7}{MnO _4^{-}} \rightarrow Mn ^{+2}$
change in ox. no. $=5$