JEE MAIN - Chemistry (2022 - 26th July Morning Shift - No. 5)
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 :
5
1
7
2
Explanation
$2 \overset{+7}{\mathrm{KMnO}_{4}}+5 \mathrm{H}_{2} \mathrm{C}_{2} \mathrm{O}_{4}+3 \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow$
$$
\mathrm{K}_{2} \mathrm{SO}_{4}+2 \overset{+2}{\mathrm{MnSO}_{4}}+10 \mathrm{CO}_{2}+8 \mathrm{H}_{2} \mathrm{O}
$$
Change is oxidation state $M n$ is 5.
Change is oxidation state $M n$ is 5.
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