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Oxidation and reduction

Chemistry • Oxidation–Reduction Reactions • Knowledge-Based • 5 questions

Oxidation and reduction Knowledge-Based Download PDF

Chemistry · Redox & Electrochemistry · Chemistry · Oxidation–Reduction Reactions

5 Chemistry practice questions on Oxidation and reduction. Questions that assess core concepts and understanding.

Questions

  1. 1.

    Which of the following half-reactions represents an oxidation process?

    • A) MnO4−(aq)+8H+(aq)+5e−→Mn2+(aq)+4H2O(l)\text{MnO}_4^-(aq) + 8\text{H}^+(aq) + 5e^- \rightarrow \text{Mn}^{2+}(aq) + 4\text{H}_2\text{O}(l)
    • B) Cl2(g)+2e−→2Cl−(aq)\text{Cl}_2(g) + 2e^- \rightarrow 2\text{Cl}^-(aq)
    • C) Sn2+(aq)→Sn4+(aq)+2e−\text{Sn}^{2+}(aq) \rightarrow \text{Sn}^{4+}(aq) + 2e^-
    • D) Fe3+(aq)+e−→Fe2+(aq)\text{Fe}^{3+}(aq) + e^- \rightarrow \text{Fe}^{2+}(aq)
  2. 2.

    During the reduction of the dichromate ion (Cr2O72−\text{Cr}_2\text{O}_7^{2-}) to the chromium(III) ion (Cr3+\text{Cr}^{3+}), what is the change in the oxidation number of each chromium atom?

    • A) An increase of 3
    • B) A decrease of 3
    • C) A decrease of 6
    • D) An increase of 6
  3. 3.

    Which of the following chemical equations does NOT represent an oxidation–reduction reaction?

    • A) 2Mg(s)+O2(g)→2MgO(s)2\text{Mg}(s) + \text{O}_2(g) \rightarrow 2\text{MgO}(s)
    • B) Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)\text{Zn}(s) + 2\text{HCl}(aq) \rightarrow \text{ZnCl}_2(aq) + \text{H}_2(g)
    • C) AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)\text{AgNO}_3(aq) + \text{NaCl}(aq) \rightarrow \text{AgCl}(s) + \text{NaNO}_3(aq)
    • D) CH4(g)+2O2(g)→CO2(g)+2H2O(g)\text{CH}_4(g) + 2\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(g)
  4. 4.

    In which of the following chemical reactions does the same element undergo both oxidation and reduction?

    • A) Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)\text{Zn}(\text{s}) + 2\text{HCl}(\text{aq}) \rightarrow \text{ZnCl}_2(\text{aq}) + \text{H}_2(\text{g})
    • B) AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)\text{AgNO}_3(\text{aq}) + \text{NaCl}(\text{aq}) \rightarrow \text{AgCl}(\text{s}) + \text{NaNO}_3(\text{aq})
    • C) CaCO3(s)→CaO(s)+CO2(g)\text{CaCO}_3(\text{s}) \rightarrow \text{CaO}(\text{s}) + \text{CO}_2(\text{g})
    • D) Cl2(g)+2NaOH(aq)→NaCl(aq)+NaClO(aq)+H2O(l)\text{Cl}_2(\text{g}) + 2\text{NaOH}(\text{aq}) \rightarrow \text{NaCl}(\text{aq}) + \text{NaClO}(\text{aq}) + \text{H}_2\text{O}(\text{l})
  5. 5.

    In the reaction 2Fe2+(aq) + Cl2(g) → 2Fe3+(aq) + 2Cl−(aq), which statement correctly identifies the species that is oxidized and the oxidizing agent?

    • A) Fe2+ is oxidized, and Cl2 is the oxidizing agent.
    • B) Cl2 is oxidized, and Fe2+ is the oxidizing agent.
    • C) Fe2+ is reduced, and Cl2 is the reducing agent.
    • D) Cl2 is reduced, and Fe2+ is the oxidizing agent.