Question

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

• A. $7$
• B. $2$
• C. $5$
• D. $1$

Answer 1

The correct option is C $5$

$2K\stackrel{+7}{Mn}{O}_4+5H_2{C}_2{O}_4+3H_{2}S{O}_4\to K_{2}S{O}_4+2\stackrel{+2}{Mn}S{O}_4+10C{O}_2+8H_{2}O$

Change in oxidation state $Mn$ is $5$.