JEE Main 2022 · 26 Jul · Shift 1 · Chemistry Q69

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ChemistrySingle correct+4 / -1Question 69 of 90

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 :

Answer and worked solution

Official answer: A

Mn goes from +7 to +2: change 5.

(A)

Topics:Redox titrations Important compounds (KMnO4, K2Cr2O7)

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JEE Main 2022 · 26 Jul · Shift 1, Chemistry question 69