ACE Your Redox Reactions

10 Questions | Total Attempts: 4749

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One of the ways we discovered to know if a redox reaction has occurred, you will find that the oxidation numbers of two elements has changed from the reactant side to the product side an example is the formation of hydrogen fluoride. This quiz will test your understanding of redox reactions, including oxidizing and reducing agents. Give it a try and ace your redox reactions test.


Questions and Answers
  • 1. 
    Which change is oxidation?
    • A. 

      Gain of electrons

    • B. 

      Gain of hydrogen

    • C. 

      Loss of oxygen

    • D. 

      Loss of electrons

  • 2. 
    Which change is reduction?
    • A. 

      A decrease in oxidation state

    • B. 

      Gain of oxygen

    • C. 

      Loss of electrons

    • D. 

      Loss of hydrogen

  • 3. 
    What is the oxidation state of chromium in the oxide CrO3?
    • A. 

      +3

    • B. 

      -3

    • C. 

      +6

    • D. 

      -6

  • 4. 
    Magnesium displaces lead ions from a solution of lead(II) sulphate. Which statement about this reaction is true?  
    • A. 

      Lead (II) ions are oxidized.

    • B. 

      Magnesium atoms are oxidised.

    • C. 

      Lead (II) ions lose electrons.

    • D. 

      Magnesium atoms gain electrons .

  • 5. 
    Which one of the following substances is a reducing agent?
    • A. 

      Argon

    • B. 

      Oxygen

    • C. 

      Carbon dioxide

    • D. 

      Carbon monoxide

  • 6. 
    Which compound, when added to aqueous iron(II) sulphate, takes part in a redox reaction?
    • A. 

      Ammonia

    • B. 

      Barium chloride

    • C. 

      Acidified potassium manganate (VII)

    • D. 

      Sodium hydroxide

  • 7. 
    Acidified potassium dichromate (VI) can be used to detect the presence of ethanol vapour in the breath of a person who consumed alcohol. A colour change from orange to green is observed if ethanol is present.This shows that ethanol is
    • A. 

      An alkali

    • B. 

      An indicator

    • C. 

      An oxidising agent

    • D. 

      A reducing agent

  • 8. 
    What is the oxidation state of sulphur in SO32-
    • A. 

      -4

    • B. 

      -2

    • C. 

      +2

    • D. 

      +4

    • E. 

      +6

  • 9. 
    In which reaction is the first substance acting as a reducing agent?
    • A. 

      Chlorine + iron(II) chloride ---> iron(III) chloride

    • B. 

      Copper(II) oxide + hydrogen ---> copper + water

    • C. 

      Hydrochloric acid + magnesium oxide ---> magnesium chloride + water

    • D. 

      Carbon monoxide + zinc oxide ---> zinc + carbon dioxide

  • 10. 
    Hydrogen peroxide, H2O2, reacts with silver oxide according to the following equation.Ag2O(s) + H2O2(l) ---> 2Ag(s) + H2O(l) + O2(g)In this reaction, hydrogen peroxide behaves as
    • A. 

      An acid

    • B. 

      A catalyst

    • C. 

      A dehydrating agent

    • D. 

      An oxidising agent

    • E. 

      A reducing agent

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