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Change in oxidation state or electrons in a reduction half reaction

This type of question, asked 2 times: 2021 Paper 15, 30 Jan 2023. All 2 questions below, oldest first.

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  1. Question 1

    2021 Paper 15

    32
    In which of the following changes does the oxidation state change by 5?

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  2. Question 2

    30 Jan 2023

    54
    The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is