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Oxidation state of the central metal in a given complex

This type of question, asked 5 times: 9 May 2023 S2, 15 May 2023 S1, 14 May 2024 S2, 16 Apr 2026 S1, 19 Apr 2026 S1. All 5 questions below, oldest first.

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  1. Question 1

    9 May 2023 S2

    79
    What is the oxidation state of central metal ion in Fe(CN)64−_6^{4-} complex?

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  2. Question 2

    15 May 2023 S1

    73
    What is the number of electrons lost by Cr in a complex Cr(CO)6\text{Cr(CO)}_{6}?

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  3. Question 3

    14 May 2024 S2

    71
    What is the oxidation number of Pt in [PtCl6]2−[PtCl_6]^{2-}?

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  4. Question 4

    16 Apr 2026 S1

    37
    Identify oxidation state of cobalt ion in the complex, [Co(NH3)5Br]SO4[\mathrm{Co(NH_3)_5Br}]\mathrm{SO_4} .

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  5. Question 5

    19 Apr 2026 S1

    36
    What is the oxidation state of cobalt in [Co(NH3)6]3+[\mathrm{Co(NH_3)_6}]^{3+} ?

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