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KMnO4 and oxalic acid titration: oxidation number changes and H+ needed

This type of question, asked 3 times: 26 Jul 2022, 27 Jul 2022, 31 Jan 2024. All 3 questions below, oldest first.

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  1. Question 1

    26 Jul 2022

    39
    The dark purple colour of KMnO4KMnO_{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. Question 2

    27 Jul 2022

    58
    In the titration of KMnO4KMnO_{4} and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is

  3. Question 3

    31 Jan 2024

    145
    Number of moles of H+H^{+}ions required by 1 mole of MnO4−MnO_{4}^{-}to oxidise oxalate ion to CO2CO_{2} is _____ .