Quiz  /  Oxidation Reduction Class 9 MCQ Questions With Answers

  • 1. 
    Which of the following is NOT an example of an oxidation reduction reaction?

  • metal rusting
  • acid neutralizing base
  • burning methane
  • photosynthesis

  • 2. 
    Determine the oxidation number of the selected element in each ion/ compound. a) N in N2O4 b) Cr in CrO4 2- c) I in IO3-

  • +8, -6, +5
  • +2, +8, +6
  • +4, +6, +5
  • -4, -6, -5
  • -4, -8, -6

  • 3. 
    Which element was reduced in the reaction below?Na + PbCl2 → Pb + NaCl

  • Na
  • Pb
  • Cl
  • No element was reduced

  • 4. 
    Of the 5 types of reactions, which one(s) are oxidation-reduction?

  • all of them
  • only double replacement
  • double replacement and combustion
  • all of them except double replacement

  • 5. 
    What are the oxidation numbers of manganese in the manganese compounds shown below?

  • A
  • B
  • C
  • D

  • 6. 
    Which of these equations represents a redox reaction?

  • Ca(HCO3)2 --> CaCO3 + H2O + CO2
  • CH3COOH + NaOH --> CH3COONa + H2O
  • Zn + 2FeCl3 --> ZnCl2 + 2FeCl2
  • NaCl + AgNO3 --> AgCl + NaNO3

  • 7. 
    If an atom lost electrons, it...

  • was burned
  • was reduced
  • was oxidized
  • it became negative

  • 8. 
    An element's oxidation numbers changed from zero to +2 during a reaction. What happened to that element?

  • It was oxidized
  • It was reduced
  • It was both oxidized and reduced
  • It was neither oxidized nor reduced

  • 9. 
    Which element was oxidized in the reaction below?Na + PbCl2 → Pb + NaCl

  • Na
  • Pb
  • Cl
  • No element was reduced

  • 10. 
    If oxidation happened, then...

  • something gained electrons
  • reduction also happened
  • flames are always involved
  • oxygen is always involved

  • 11. 
    What is the oxidation number on the nitrogen in NO?

  • 0
  • -1
  • -2
  • +2

  • 12. 
    Substances that lose electrons easily and are oxidized in a chemical reaction are ____________.

  • reducing agents
  • coloring agents
  • oxidizing agents
  • neutralizing agents
  • analytical agents

  • 13. 
    The change of I‾ to I2 is ________________

  • oxidation
  • reduction
  • neutralization
  • Decomposition
  • Combustion

  • 14. 
    What is the oxidation number of Nitrogen in HNO3

  • -7
  • -5
  • +5
  • +7
  • +2

  • 15. 
    What is the oxidation number on the nitrogen in Mg3N2?

  • 0
  • -2
  • -3
  • +3

  • 16. 
    A camera film is covered with silver ions that darkens upon exposure to light. The reaction thattakes place is: Ag + + e‾ → Ag. In this reaction, silver ion acts as ____________

  • reducing agent.
  • dissolving agent.
  • analytical agent.
  • oxidizing agent

  • 17. 
    Which of the following has an oxidation number of zero on the chlorine atom?

  • NaCl
  • Cl2
  • Cl-
  • ClO3-

  • 18. 
    Which of the following statements refers to an oxidation process?

  • Hydrogen is added to ethene
  • Oxygen is removed from carbon dioxide
  • Chlorine accepts electrons
  • Increase in the oxidation number of magnesium metal

  • 19. 
    What is the oxidation number of chlorine in ClO3- ?

  • -1
  • +1
  • -1
  • +5

  • 20. 
    Which statement is true:Mg → Mg2+ + 2e–

  • Mg gains 2 electrons
  • Mg2+ loses 2 electrons
  • Mg loses 1 electron
  • Mg loses 2 electrons

  • 21. 
    An element's oxidation numbers became more negative during a reaction. What happened to that element?

  • It was oxidized
  • It was reduced
  • It was both oxidized and reduced
  • It was neither oxidized nor reduced

  • 22. 
    The below reaction is an example of _________reaction.F2 → 2 F- + 2 e-

  • Oxidation
  • Reduction
  • Neutralization
  • decomposition
  • combustion

  • 23. 
    An element's oxidation numbers remain the same during a reaction. What happened to that element?

  • It was oxidized
  • It was reduced
  • It was both oxidized and reduced
  • It was neither oxidized nor reduced

  • 24. 
    In a redox reaction, the species reduced

  • gains electrons and is the oxidizing agent
  • loses electrons and is the oxidizing agent
  • loses electrons and is the reducing agent
  • gains electrons and is the reducing agent

  • 25. 
    During the process of reduction, _________________

  • protons are lost.
  • protons are gained.
  • electrons are lost.
  • electrons are gained
  • neutrons are lost.

  • 26. 
    What is the oxidation number on the nitrogen in NO2-?

  • -1
  • +3
  • -3
  • +4

  • 27. 
    Identify the species reduced in the following reaction.Fe(s) + 2 Ag+(aq) → Fe2+(aq) + 2 Ag(s)

  • Fe
  • Ag
  • none of these
  • None of the above
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