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Oxidation number of phosphorus in a phosphate

This type of question, asked 3 times: 25 Apr 2025 S1, 13 May 2026 S2, 14 May 2026 S1. All 3 questions below, oldest first.

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  1. Question 1

    25 Apr 2025 S1

    92
    What is the oxidation number of phosphorus in calcium phosphate?

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  2. Question 2

    13 May 2026 S2

    14
    What is the oxidation number of phosphorus in Ca3(PO4)2\mathrm{Ca_3(PO_4)_2}?

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  3. Question 3

    14 May 2026 S1

    12
    What is the oxidation number of P in NaH2PO4\mathrm{NaH_2PO_4}?

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