Oxidation numbers

Oxidation numbers Quiz

Edexcel A-Level Chemistry: Quiz

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5 questions, one answer each

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  1. 1. What is the oxidation number of Cr in Cr₂O₇²⁻?

    • A. +3
    • B. +6
    • C. +7
    • D. +12

  2. 2. What is the oxidation number of oxygen in Na₂O₂?

    • A. −1
    • B. −2
    • C. 0
    • D. +1

  3. 3. In which compound does hydrogen have an oxidation number of −1?

    • A. H₂O
    • B. HCl
    • C. NaH
    • D. NH₃

  4. 4. What is the formula of copper(II) nitrate?

    • A. Cu₂NO₃
    • B. CuNO₃
    • C. Cu₂(NO₃)₃
    • D. Cu(NO₃)₂

  5. 5. Which reaction is a disproportionation?

    • A. Mg + 2HCl → MgCl₂ + H₂
    • B. 2H₂O₂ → 2H₂O + O₂
    • C. CaO + 2HCl → CaCl₂ + H₂O
    • D. Zn + Cu²⁺ → Zn²⁺ + Cu

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