Redox Reactions :d

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A quiz with 5 MCQ questions on redox reactions


Questions and Answers
  • 1. 
    The reaction between mangananese metal (Mn) and dilute acid is shown by the following ionic equation: Mn(s) + 2H+ (aq) --> Mn2+ (aq) + H2 (g)Which one of the following shows the change in oxidisation state of the hydrogen in this reaction?
    • A. 

      +1 to 0

    • B. 

      0 to +1

    • C. 

      +2 to 0

    • D. 

      +2 to +1

  • 2. 
    Which of the following underlined atoms are reduced?(i)PbCl2 + Cl2 --> PbCl4(ii)NaOH + HCl --> I2 + 5SO42- + 3H + H20(iii)2IO3- + 5HSO3- --> I2 + 5SO42- + 3H+ + H2O(iv)Cu+1/2O2 --> CuO
    • A. 

      I and iv

    • B. 

      Ii and iii

    • C. 

      Iii and iv

    • D. 

      I, ii and iii

    • E. 

      I, ii, iii and iv

  • 3. 
    Which reagent is used to test for oxidising agents?
    • A. 

      Acidified dichromate(VI) solution

    • B. 

      Potassium iodide solution

    • C. 

      Iodine Solution

    • D. 

      Acidified potassium manganate (VII) solution

  • 4. 
    In electrolysis, Oxidisation always takes place
    • A. 

      At the cathode

    • B. 

      At the anode

    • C. 

      At both electrodes

    • D. 

      Between the two electrodes

  • 5. 
    A reducing agent can
    • A. 

      Give oxygen to another substance

    • B. 

      Decrease the oxidisation state of another substance

    • C. 

      Take hydrogen from another substance

    • D. 

      Take electrons from another substance