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Oxidation number of manganese or chromium in permanganate, chromate and dichromate

This type of question, asked 3 times: 15 May 2023 S1, 16 May 2023 S2, 11 May 2024 S1. All 3 questions below, oldest first.

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  1. Question 1

    15 May 2023 S1

    61
    Calculate the oxidation number of Cr in CrO42−\text{CrO}_{4}^{2-} ion and K2Cr2O7\text{K}_{2}\text{Cr}_{2}\text{O}_{7} respectively.

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  2. Question 2

    16 May 2023 S2

    96
    What is the oxidation number of Mn in MnO4−\text{MnO}_4^-?

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  3. Question 3

    11 May 2024 S1

    84
    Oxidation state of manganese in potassium permanganate is:

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