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 :
Hello 👋 Welcome to Competishun – India’s most trusted platform for JEE & NEET preparation. Need help with JEE / NEET courses, fees, batches, test series or free study material? Chat with us now 👇