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3d metals and their M2+/M electrode potentials (copper and liberating H2)

This type of question, asked 3 times: 2021 Paper 1, 27 Jun 2022, 28 Jul 2022. All 3 questions 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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  3. Question 3

    28 Jul 2022

    40
    Which of the following has least tendency to liberate H2H_{2} from mineral acids?

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