Quiz  /  Oxidation Reduction Class 11 MCQ Questions With Answers

  • 1. 
    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

  • 2. 
    The change of I‾ to I2 is ________________

  • oxidation
  • reduction
  • neutralization
  • Decomposition
  • Combustion

  • 3. 
    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

  • 4. 
    What is the oxidation number of chlorine in ClO3- ?

  • -1
  • +1
  • -1
  • +5

  • 5. 
    The below reaction is an example of _________reaction.F2 → 2 F- + 2 e-

  • Oxidation
  • Reduction
  • Neutralization
  • decomposition
  • combustion

  • 6. 
    Which of the following chemical can oxidize chloride ion to chlorine?

  • potassium manganate(VII)
  • iron(III) sulphate
  • aqueous bromine
  • potassium

  • 7. 
    Based on this equation: 2 I- + 2 Fe → 2Fe2+ + I2. Which of the following is true about the ionic equation?

  • Fe3+ is oxidized
  • Fe3+ is a reducing agent
  • I- is an oxidizing agent
  • I- donates electrons to Fe3+

  • 8. 
    Below is the half equation of a reaction 2 I- -> I2 + 2e-What is meant by oxidation reaction based on the equation?

  • Electrons are received by iodine
  • Electrons are donated by iodine
  • Electrons are donated by iodide ions
  • Electrons are received by iodide ions

  • 9. 
    Which of the following are oxidizing agents?I MagnesiumII Acidified potassium manganate(VII) solutionIII Bromine waterIV Potassium iodide solution

  • I and III only
  • I and IV only
  • II and III only
  • I, II and III only

  • 10. 
    Which of these reagents can be used to convert Fe2+ to Fe3+ ion?I. Magnesium powderII. Potassium iodide solutionIII. Potassium hexacyanoferrate(II) solutionIV. Acidified potassium manganate(VII) solution

  • I and II only
  • II and III only
  • I, II and III only
  • I, II, III and IV

  • 11. 
    What is the oxidation number of chromium element in potassium dichromate(VI), K2 Cr2O7?

  • +2
  • +3
  • +5
  • +6

  • 12. 
    A galvanic cell was created with a Calcium and a Copper cell. Which is the correct half equation at the anode?

  • Ca2+(aq)+2e−⟺ Ca(s)Ca^{2+}\left(aq\right)+2e^-\Longleftrightarrow\ Ca\left(s\right)Ca2+(aq)+2e−⟺ Ca(s)
  • Ca++e−⟺ Ca(s)Ca^++e^-\Longleftrightarrow\ Ca\left(s\right)Ca++e−⟺ Ca(s)
  • Cu2+(aq) + e− ⟺ Cu+(aq)Cu^{2+}\left(aq\right)\ +\ e^-\ \Longleftrightarrow\ Cu^+\left(aq\right)Cu2+(aq) + e− ⟺ Cu+(aq)
  • Cu2+(aq) + 2e− ⟺ Cu(s)Cu^{2+}\left(aq\right)\ +\ 2e^-\ \Longleftrightarrow\ Cu\left(s\right)Cu2+(aq) + 2e− ⟺ Cu(s)

  • 13. 
    Batteries are an example of:

  • an electrolytic cell
  • a chemical cell
  • electrical cells
  • a galvanic cell

  • 14. 
    Find the oxidation number of S in S2O4 2-

  • +3
  • +6
  • -6
  • -3
  • -4

  • 15. 
    Which of the following is NOT a redox reaction?

  • Displacement
  • Decomposition
  • Synthesis
  • Neutralisation
  • Combustion

  • 16. 
    In a hydrogen fuel cell:

  • hydrogen is oxidized at the cathode
  • water is produced
  • oxygen in oxidized at the anode
  • water is split into hydrogen and oxygen gas

  • 17. 
    Reduction is the ___________ of electrons.

  • loss
  • gain
  • transfer
  • share

  • 18. 
    From the list below, which step comes first when you are balancing half-equations?

  • Add H2O to balance oxygen
  • Balance elements other that O and H
  • Balance the charge with e-
  • Add H+ to balance hydrogen

  • 19. 
    An aqueous solution of potassium iodide turns from colourless to brown. What happens to the iodide ions?

  • Iodide ions are oxidised due to gain of electrons.
  • Iodide ions are oxidised due to loss of electrons.
  • Iodide ions are reduced due to loss of electrons.
  • Iodide ions are reduced due to gain of electrons.

  • 20. 
    Which of the following elements is the strongest oxidizing agent?

  • Chlorine
  • Aluminium
  • Hydrogen
  • Lithium

  • 21. 
    In a galvanic cell, where does the oxidation reaction take place?

  • circuit
  • salt bridge
  • cathode
  • anode

  • 22. 
    What is the oxidation state of Nitrogen in N2 (g)?

  • 4
  • 6
  • 2
  • 0

  • 23. 
    Find the oxidation number of Ca in CaH2

  • -2
  • -4
  • +2
  • +4
  • 0

  • 24. 
    Which of the following is the balanced half -reaction for the oxidation of Cu to Cu+2?

  • Cu --> Cu+2
  • Cu + 2 e- --> Cu+2
  • Cu - 2e- --> Cu+2
  • Cu --> Cu+2 + 2 e-

  • 25. 
    The oxidation number of Hydrogen in KH potassium hydride equals:

  • -1
  • +1
  • 0
  • 2

  • 26. 
    In a galvanic cell, what ensures the charges of each solution remain balanced?

  • circuit
  • salt bridge
  • cathode
  • anode

  • 27. 
    From the list below, which step comes last when you are balancing half-equations?

  • Add H2O to balance oxygen
  • Balance elements other that O and H
  • Balance the charge with e-
  • Add H+ to balance hydrogen

  • 28. 
    Oxidation is....

  • Gain of electrons
  • Loss of electrons
  • Both the loss and gain of electrons
  • None of these

  • 29. 
    Determine the oxidation number of chromium in CrO42-.

  • 5
  • 6
  • 4
  • 2

  • 30. 
    Which of the following ion(s) is/are able to act as reducing agent(s)?I Cu2+II Fe2+III Sn2+IV Mg2+

  • II only
  • I and II only
  • II and III only
  • II, III and IV only
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