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REDOX REACTION MCQs

Total Questions : 20 | Page 2 of 2 pages
Question 11. The oxidation number of oxidant increases in a Redox reaction
  1.    true
  2.    false
 Discuss Question
Answer: Option B. -> false
Question 12. A redox reaction is spontaneous when:
  1.    E0 = 0
  2.    E0 > 0
  3.    E0 < 0
  4.    None
 Discuss Question
Answer: Option B. -> E0 > 0
Question 13. Which statement is the correct one?
  1.    Comproportionating is a redox reaction in which the oxidation number of an element is simultaneously raised and lowered. Disproportionation is the opposite of comproportionating.
  2.    Disproportionation is a reaction in which the oxidation number of an element is raised. Comproportionating is a reaction in which the oxidation number of an element is lowered.
  3.    Disproportionation is a redox reaction in which the oxidation number of an element is simultaneously raised and lowered. Comproportionating is the opposite of disproportionation.
  4.    None
 Discuss Question
Answer: Option C. -> Disproportionation is a redox reaction in which the oxidation number of an element is simultaneously raised and lowered. Comproportionating is the opposite of disproportionation.
Question 14. In the reaction Zn + H2O --> ZnO2 + H2 which element, if any, is oxidized?
  1.    Zn0
  2.    Zn+2
  3.    O-2
  4.    H20
 Discuss Question
Answer: Option A. -> Zn0
Question 15. All the redox reactions can be broken down into _________ different processes
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option B. -> 2
Question 16. As an element is oxidized, its oxidation number
  1.    increases as electrons are gained
  2.    decreases as electrons are gained
  3.    decreases as electrons are lost
  4.    increases as electrons are lost
 Discuss Question
Answer: Option D. -> increases as electrons are lost
Question 17. Oxidation-reduction reactions occur because of the competition between particles for
  1.    protons
  2.    neutrons
  3.    electrons
  4.    positrons
 Discuss Question
Answer: Option C. -> electrons
Question 18. Which change is an oxidation?
  1.    FeO to Fe2O3
  2.    Fe2O3 to FeO
  3.    H2O2 to H2O
  4.    H2O to H2
 Discuss Question
Answer: Option A. -> FeO to Fe2O3
Question 19. Which substance is reduced in the following reaction? NaOH + Li --> LiOH + Na
  1.    Li
  2.    Na
  3.    O
  4.    H
 Discuss Question
Answer: Option B. -> Na
Question 20. Which equation represents a redox reaction?
  1.    NaOH + HNO3 → NaNO3 +H2O
  2.    2AgNO3 + Zn → Zn(NO3)2 + 2Ag
  3.    2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3
  4.    CaCO3 + 2HCl → CaCl2 + H2O + CO2
 Discuss Question
Answer: Option B. -> 2AgNO3 + Zn → Zn(NO3)2 + 2Ag

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