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Oxidation state of an element in a given compound or ion

This type of question, asked 2 times: 16 May 2023 S1, 9 May 2024 S1. All 2 questions below, oldest first.

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  1. Question 1

    16 May 2023 S1

    78
    What is the oxidation state of phosphorus in phosphate ion?

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  2. Question 2

    9 May 2024 S1

    81
    What is the oxidation state of carbon in CaC2CaC_2 and K2C2O4K_2C_2O_4 respectively?

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