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The 3d metal with a positive (highest) M2+/M standard electrode potential

The same question, asked 2 times: 2021 Paper 1, 27 Jun 2022. Every wording below, oldest first.

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  1. Question 1

    2021 Paper 1

    36
    The electrode potential of M2+/MM^{2 +}/M of 3 d3\text{ }d - series elements shows positive value for:

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  2. Question 2

    27 Jun 2022

    128
    In 3 d3\text{ }d series, the metal having the highest M2+/MM^{2 +}/M standard electrode potential is

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