Quiz  /  Redox Reaction Class 12 MCQ Questions With Answers

  • 1. 
    As an element is oxidized, its oxidation number...

  • increases as electrons are gained
  • decreases as electrons are gained
  • decreases as electrons are lost
  • increases as electrons are lost

  • 2. 
    Which substance is reduced in the following reaction? NaOH + Li --> LiOH + Na

  • Li
  • Na
  • O
  • H

  • 3. 
    Mg + PbCl2 --> MgCl2 + Pb. Which statement correctly describes the oxidation and reduction that occur?

  • Mg is oxidized and Cl- is reduced
  • Mg is oxidized and Pb+2 is reduced
  • Mg is reduced and Cl- is oxidized
  • Mg is reduced and Pb+2 is oxidized

  • 4. 
    Which change is an oxidation?

  • FeO to Fe2O3
  • Fe2O3 to FeO
  • H2O2 to H2O
  • H2O to H2

  • 5. 
    Which equation represents a redox reaction?

  • NaOH + HNO3 → NaNO3 +H2O
  • 2AgNO3 + Zn → Zn(NO3)2 + 2Ag
  • 2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3
  • CaCO3 + 2HCl → CaCl2 + H2O + CO2

  • 6. 
    In the reaction Zn + H2O --> ZnO2 + H2 which element, if any, is oxidized?

  • Zn0
  • Zn+2
  • O-2
  • H20
  • None

  • 7. 
    The equations below all show redox reactions.Which oxide is oxidised in these reactions?

  • Fe2O3
  • CO
  • ZnO
  • NO

  • 8. 
    Oxidation-reduction reactions occur because of the competition between particles for...

  • protons
  • neutrons
  • electrons
  • positrons
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