Quiz  /  Oxidation Reduction Class 10 MCQ Questions With Answers

  • 1. 
    Gaining oxygen is an example of...

  • oxidation
  • reduction

  • 2. 
    Which of the following half reactions correctly represents a reduction half reaction?

  • Fe →Fe2+ + 2e-
  • Pb4+ + 2e- →Pb2+
  • 2O-2 →O2 + 4e-
  • Fe + 3e- →Fe3+

  • 3. 
    What substance is oxidized in the following reaction?4Fe + 3O2 --> 2Fe2O3

  • Iron
  • Fluorine
  • Oxygen
  • None of these

  • 4. 
    Which of the following reagents are able to change bromide ion in sodium bromide solution to bromine?I Sodium thiosulphate solutionII Acidified potassium dichromate(IV) solutionIII Acidified sodium chlorate(I) solutionIV Iodine solution

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

  • 5. 
    The diagram shows two metals P and Q connected together in a liquid jelly. Metal Q is more electropositive than metal P. Which of the following statements is true?

  • P is oxidised
  • Q is reduced
  • The oxidation number of metal P has increased
  • The oxidation number of metal Q has increased

  • 6. 
    In a reaction, copper is reduced; its number of electrons has:

  • Increased
  • Decreased
  • Remained Constant
  • Varies Randomly

  • 7. 
    Which of the following is the oxidising agent in the experiment shown the diagram?

  • Iron(II) ion
  • Sulphate ion
  • Iron
  • Bromine

  • 8. 
    In the reaction Zn + H2O --> ZnO2 + H2 which element, if any, is oxidized?

  • Zinc
  • Hydrogen
  • Oxygen
  • None

  • 9. 
    The table shows four chemical changes. Which changes involve donation of electrons?

  • P and Q P and R Q and S R and S
  • P and R
  • Q and S
  • R and S

  • 10. 
    In a redox reaction, spectator ions...

  • become oxidised
  • become reduced
  • remain unchanged
  • All of above

  • 11. 
    In an electrochemical cell, tin becomes a negative terminal when it is connected to

  • aluminium
  • lead
  • magnesium
  • zinc

  • 12. 
    Which of the following chemical can oxidize chloride ion to chlorine?

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

  • 13. 
    Oxidation is the _________ of electrons.

  • loss
  • gain
  • sharing
  • transfer

  • 14. 
    A mixture of magnesium oxide, copper(II) oxide and zinc powder is heated in a crucible until no further changes are observed. After heating, the mixture contains:

  • magnesium, copper(II) oxide and zinc
  • magnesium oxide, copper and zinc oxide
  • magnesium oxide, copper(II) oxide and zinc
  • magnesium, copper and zinc oxide

  • 15. 
    Which of the following statements is not true when zinc powder is added to dilute hydrochloric acid?

  • Zinc is oxidised
  • Chloride ion acts as an oxidising agent
  • Hydrogen ion is reduced
  • Electrons are transferred in the reaction

  • 16. 
    Another name for a "oxidation-reduction" reaction is

  • chemical reaction
  • neutralization reaction
  • redox reaction
  • nuclear reaction

  • 17. 
    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+

  • 18. 
    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

  • 19. 
    Below is an ionic equation.P(s) + Q2+ -> P2+ (aq) + Q(s)Which of the following is true about the equation?

  • P2+ is a reducing agent
  • P donates electrons to Q2+
  • P is an oxidizing agent
  • Q2+ is oxidized

  • 20. 
    Which of the following electron arrangement is possible for an oxidizing agent?

  • 2.8
  • 2.8.8.1
  • 2.8.7
  • 2.8.8.2

  • 21. 
    If an atom loses electrons during a chemical reaction, the atom was:

  • Oxidized
  • Reduced
  • Neutralized
  • Precipitated

  • 22. 
    Gaining hydrogen is an example of...

  • oxidation
  • reduction

  • 23. 
    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

  • 24. 
    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
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