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QJEEM22Ch5684: JEE Main 2022 Chemistry - Class 12 JEEM22Ch5684 Solution: The dark purple colour of disappears in the titration with…

The dark purple colour of $\mathrm{KMnO}_{4}$ 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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2 \overset{+7}{\mathrm{KMnO}_{4}}+5 \mathrm{H}_{2} \mathrm{C}_{2} \mathrm{O}_{4}+3 \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow

\mathrm{K}_{2} \mathrm{SO}_{4}+2 \overset{+2}{\mathrm{MnSO}_{4}}+10 \mathrm{CO}_{2}+8 \mathrm{H}_{2} \mathrm{O}

Change is oxidation state

M n

is 5.

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