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Oxidation and reduction Knowledge-Based Practice

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

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

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Questions

  1. 1.

    In which of the following species does nitrogen have the lowest oxidation state?

    • A) NO2−\text{NO}_2^-
    • B) N2O\text{N}_2\text{O}
    • C) NO\text{NO}
    • D) NH4+\text{NH}_4^+
  2. 2.

    Consider the balanced redox reaction 2Al(s)+3Cu2+(aq)→2Al3+(aq)+3Cu(s)2\text{Al}(s) + 3\text{Cu}^{2+}(aq) \rightarrow 2\text{Al}^{3+}(aq) + 3\text{Cu}(s). How many moles of electrons are transferred when 2 moles of Al(s)\text{Al}(s) react completely?

    • A) 2 moles of electrons
    • B) 3 moles of electrons
    • C) 6 moles of electrons
    • D) 12 moles of electrons
  3. 3.

    In the chemical reaction Cu(s)+4HNO3(aq)→Cu(NO3)2(aq)+2NO2(g)+2H2O(l)\text{Cu}(s) + 4\text{HNO}_3(aq) \rightarrow \text{Cu}(\text{NO}_3)_2(aq) + 2\text{NO}_2(g) + 2\text{H}_2\text{O}(l), which element undergoes reduction, and by how many units does its oxidation state decrease?

    • A) Nitrogen, which decreases by 1
    • B) Copper, which decreases by 2
    • C) Nitrogen, which decreases by 3
    • D) Oxygen, which decreases by 2
  4. 4.

    Which of the following chemical reactions is classified as a disproportionation redox reaction?

    • A) CaCO3(s)→CaO(s)+CO2(g)\text{CaCO}_3(s) \rightarrow \text{CaO}(s) + \text{CO}_2(g)
    • B) 3Br2(l)+6KOH(aq)→5KBr(aq)+KBrO3(aq)+3H2O(l)3\text{Br}_2(l) + 6\text{KOH}(aq) \rightarrow 5\text{KBr}(aq) + \text{KBrO}_3(aq) + 3\text{H}_2\text{O}(l)
    • C) Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)\text{Zn}(s) + 2\text{HCl}(aq) \rightarrow \text{ZnCl}_2(aq) + \text{H}_2(g)
    • D) AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)\text{AgNO}_3(aq) + \text{NaCl}(aq) \rightarrow \text{AgCl}(s) + \text{NaNO}_3(aq)
  5. 5.

    In the redox reaction represented by the equation H2S(g)+Cl2(g)→2HCl(g)+S(s)\text{H}_2\text{S}(g) + \text{Cl}_2(g) \rightarrow 2\text{HCl}(g) + \text{S}(s), which statement correctly identifies the species that is oxidized and the reducing agent?

    • A) Cl2\text{Cl}_2 is oxidized and acts as the reducing agent.
    • B) Cl2\text{Cl}_2 is reduced and acts as the reducing agent.
    • C) H2S\text{H}_2\text{S} is reduced and acts as the oxidizing agent.
    • D) H2S\text{H}_2\text{S} is oxidized and acts as the reducing agent.

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